Terminal device, base station device, and communication method for communicating according to a determined subcarrier spacing

ABSTRACT

A terminal device includes: a higher layer processing unit configured to set at least one first RAT and at least one second RAT by signaling of a higher layer from the base station device; and a receiving unit configured to receive a transmission signal in the first RAT and a transmission signal in the second RAT. The transmission signal in the first RAT is mapped to a resource element configured on a basis of one physical parameter for each sub frame. The transmission signal in the second RAT is mapped to a resource element configured on a basis of one or more physical parameters for each sub frame and is mapped to a resource element configured on a basis of one physical parameter in a predetermined resource included in each of the sub frames.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. application Ser. No.16/088,567, filed Sep. 26, 2018, which is based on PCT filingPCT/JP2017/003683, filed Feb. 2, 2017, which claims priority to JP2016-085087, filed Apr. 21, 2016, the entire contents of each areincorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a terminal device, a base stationdevice, and a communication method.

BACKGROUND ART

Wireless access schemes and wireless networks of cellular mobilecommunication (hereinafter also referred to as Long Term Evolution(LTE), LTE-Advanced (LTE-A), LTE-Advanced Pro (LTE-A Pro), New Radio(NR), New Radio Access Technology (NRAT), Evolved Universal TerrestrialRadio Access (EUTRA), or Further EUTRA (FEUTRA)) are under review in 3rdGeneration Partnership Project (3GPP). Further, in the followingdescription, LTE includes LTE-A, LTE-A Pro, and EUTRA, and NR includesNRAT and FEUTRA. In LTE and NR, a base station device (base station) isalso referred to as an evolved Node B (eNodeB), and a terminal device (amobile station, a mobile station device, or a terminal) is also referredto as a user equipment (UE). LTE and NR are cellular communicationsystems in which a plurality of areas covered by a base station deviceare arranged in a cell form. A single base station device may manage aplurality of cells.

NR is a different Radio Access Technology (RAT) from LTE as a wirelessaccess scheme of the next generation of LTE. NR is an access technologycapable of handling various use cases including Enhanced Mobilebroadband (eMBB), Massive Machine Type Communications (mMTC), and ultrareliable and Low Latency Communications (URLLC). NR is reviewed for thepurpose of a technology framework corresponding to use scenarios,request conditions, placement scenarios, and the like in such use cases.The details of the scenarios or request conditions of NR are disclosedin Non-Patent Literature 1.

CITATION LIST Non-Patent Literature

Non-Patent Literature 1: 3rd Generation Partnership Project; TechnicalSpecification Group Radio Access Network; Study on Scenarios andRequirements for Next Generation Access Technologies; (Release 14), 3GPPTR 38.913 V0. 2.0 (2016-02).

<http://www.3gpp.org/ftp//Specs/archive/38_series/38.913/38913-020.zip>

DISCLOSURE OF INVENTION Technical Problem

In wireless access technologies, it is preferable to optimally designparameters (physical parameters) of transmission signals such as subcarrier intervals and symbol lengths in accordance with use cases.However, in review of LTE extension technologies, it is important forterminal devices using the extension technologies to performmultiplexing with terminal devices of LTE of the related art from theviewpoint of frequency use efficiency. Therefore, in extensiontechnologies in LTE, backward compatibility is requested and restrictioncan be imposed on the extension technologies. As a result, suchrestriction may have an influence on transmission efficiency of thewhole systems.

The present disclosure is devised in view of the foregoing problems andan object of the present disclosure is to provide a base station device,a terminal device, a communication system, a communication method, andan integrated circuit capable of considerably improving transmissionefficiency of the whole system by flexibly designing in accordance withvarious use cases in the communication system in which the base stationdevice and the terminal device communicate.

Solution to Problem

According to the present disclosure, there is provided a terminal devicethat communicates with a base station device, the terminal stationdevice including: a higher layer processing unit configured to set atleast one first RAT and at least one second RAT by signaling of a higherlayer from the base station device; and a receiving unit configured toreceive a transmission signal in the first RAT and a transmission signalin the second RAT. The transmission signal in the first RAT is mapped toa resource element configured on a basis of one physical parameter foreach sub frame. The transmission signal in the second RAT is mapped to aresource element configured on a basis of one or more physicalparameters for each sub frame and is mapped to a resource elementconfigured on a basis of one physical parameter in a predeterminedresource included in each of the sub frames.

In addition, according to the present disclosure, there is provided abase station device that communicates with a terminal device, the basestation device including: a higher layer processing unit configured toset at least one first RAT and at least one second RAT by signaling of ahigher layer to the terminal device; and a transmitting unit configuredto transmit a transmission signal in the first RAT and a transmissionsignal in the second RAT. The transmission signal in the first RAT ismapped to a resource element configured on a basis of one physicalparameter for each sub frame. Transmission signal in the second RAT ismapped to a resource element configured on a basis of one or morephysical parameters for each sub frame and is mapped to a resourceelement configured on a basis of one physical parameter in apredetermined resource included in each of the sub frames.

In addition, according to the present disclosure, there is provided acommunication method that is used in a terminal device communicatingwith a base station device, the communication method including: a stepof setting at least one first RAT and at least one second RAT bysignaling of a higher layer from the base station device; and a step ofreceiving a transmission signal in the first RAT and a transmissionsignal in the second RAT. The transmission signal in the first RAT ismapped to a resource element configured on a basis of one physicalparameter for each sub frame. The transmission signal in the second RATis mapped to a resource element configured on a basis of one or morephysical parameters for each sub frame and is mapped to a resourceelement configured on a basis of one physical parameter in apredetermined resource included in each of the sub frames.

In addition, according to the present disclosure, there is provided acommunication method that is used in a base station device communicatingwith a terminal device, the communication method including: a step ofsetting at least one first RAT and at least one second RAT by signalingof a higher layer to the terminal device; and a step of transmitting atransmission signal in the first RAT and a transmission signal in thesecond RAT. The transmission signal in the first RAT is mapped to aresource element configured on a basis of one physical parameter foreach sub frame. The transmission signal in the second RAT is mapped to aresource element configured on a basis of one or more physicalparameters for each sub frame and is mapped to a resource elementconfigured on a basis of one physical parameter in a predeterminedresource included in each of the sub frames.

Advantageous Effects of Invention

As described above, according to the present disclosure, it is possibleto improve the transmission efficiency in the wireless communicationsystem in which the base station device and the terminal devicecommunicate with each other.

Note that the effects described above are not necessarily limitative.With or in the place of the above effects, there may be achieved any oneof the effects described in this specification or other effects that maybe grasped from this specification.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating an example of setting of a componentcarrier according to a present embodiment.

FIG. 2 is a diagram illustrating an example of setting of a componentcarrier according to a present embodiment.

FIG. 3 is a diagram illustrating an example of a downlink sub frame ofLTE according to the present embodiment.

FIG. 4 is a diagram illustrating an example of an uplink sub frame ofLTE according to the present embodiment.

FIG. 5 is a diagram illustrating examples of parameter sets related to atransmission signal in an NR cell according to the present embodiment.

FIG. 6 is a diagram illustrating an example of an NR downlink sub frameof the present embodiment.

FIG. 7 is a diagram illustrating an example of an NR uplink sub frame ofthe present embodiment.

FIG. 8 is a schematic block diagram illustrating a configuration of abase station device of the present embodiment.

FIG. 9 is a schematic block diagram illustrating a configuration of aterminal device of the present embodiment.

FIG. 10 is a diagram illustrating an example of downlink resourceelement mapping of LTE according to the present embodiment.

FIG. 11 is a diagram illustrating an example of downlink resourceelement mapping of NR according to the present embodiment.

FIG. 12 is a diagram illustrating an example of downlink resourceelement mapping of NR according to the present embodiment.

FIG. 13 is a diagram illustrating an example of downlink resourceelement mapping of NR according to the present embodiment.

FIG. 14 is a diagram illustrating an example of a resource elementmapping method of NR according to the present embodiment.

FIG. 15 is a diagram illustrating an example of a resource elementmapping method of NR according to the present embodiment.

FIG. 16 is a block diagram illustrating a first example of a schematicconfiguration of an eNB to which the technology according to the presentdisclosure may be applied.

FIG. 17 is a block diagram illustrating a second example of theschematic configuration of the eNB to which the technology according tothe present disclosure may be applied.

FIG. 18 is a block diagram illustrating an example of a schematicconfiguration of a smartphone 900 to which the technology according tothe present disclosure may be applied.

FIG. 19 is a block diagram illustrating an example of a schematicconfiguration of a car navigation apparatus 920 to which the technologyaccording to the present disclosure may be applied.

MODE(S) FOR CARRYING OUT THE INVENTION

Hereinafter, (a) preferred embodiment(s) of the present disclosure willbe described in detail with reference to the appended drawings. Notethat, in this specification and the appended drawings, structuralelements that have substantially the same function and structure aredenoted with the same reference numerals, and repeated explanation ofthese structural elements is omitted. Further, technologies, functions,methods, configurations, and procedures to be described below and allother descriptions can be applied to LTE and NR unless particularlystated otherwise.

<Wireless Communication System in the Present Embodiment>

In the present embodiment, a wireless communication system includes atleast a base station device 1 and a terminal device 2. The base stationdevice 1 can accommodate multiple terminal devices. The base stationdevice 1 can be connected with another base station device by means ofan X2 interface. Further, the base station device 1 can be connected toan evolved packet core (EPC) by means of an S1 interface. Further, thebase station device 1 can be connected to a mobility management entity(MME) by means of an S1-MME interface and can be connected to a servinggateway (S-GW) by means of an S1-U interface. The S1 interface supportsmany-to-many connection between the MME and/or the S-GW and the basestation device 1. Further, in the present embodiment, the base stationdevice 1 and the terminal device 2 each support LTE and/or NR.

<Wireless Access Technology According to Present Embodiment>

In the present embodiment, the base station device 1 and the terminaldevice 2 each support one or more wireless access technologies (RATs).For example, an RAT includes LTE and NR. A single RAT corresponds to asingle cell (component carrier). That is, in a case in which a pluralityof RATs are supported, the RATs each correspond to different cells. Inthe present embodiment, a cell is a combination of a downlink resource,an uplink resource, and/or a sidelink. Further, in the followingdescription, a cell corresponding to LTE is referred to as an LTE celland a cell corresponding to NR is referred to as an NR cell. Further,LTE is referred to as a first RAT and NR is referred to as a second RAT.

Downlink communication is communication from the base station device 1to the terminal device 2. Uplink communication is communication from theterminal device 2 to the base station device 1. Sidelink communicationis communication from the terminal device 2 to another terminal device2.

The sidelink communication is defined for contiguous direct detectionand contiguous direct communication between terminal devices. Thesidelink communication, a frame configuration similar to that of theuplink and downlink can be used. Further, the sidelink communication canbe restricted to some (sub sets) of uplink resources and/or downlinkresources.

The base station device 1 and the terminal device 2 can supportcommunication in which a set of one or more cells is used in a downlink,an uplink, and/or a sidelink. A set of a plurality of cells is alsoreferred to as carrier aggregation or dual connectivity. The details ofthe carrier aggregation and the dual connectivity will be describedbelow. Further, each cell uses a predetermined frequency bandwidth. Amaximum value, a minimum value, and a settable value in thepredetermined frequency bandwidth can be specified in advance.

FIG. 1 is a diagram illustrating an example of setting of a componentcarrier according to the present embodiment. In the example of FIG. 1,one LTE cell and two NR cells are set. One LTE cell is set as a primarycell. Two NR cells are set as a primary and secondary cell and asecondary cell. Two NR cells are integrated by the carrier aggregation.Further, the LTE cell and the NR cell are integrated by the dualconnectivity. Note that the LTE cell and the NR cell may be integratedby carrier aggregation. In the example of FIG. 1, NR may not supportsome functions such as a function of performing standalone communicationsince connection can be assisted by an LTE cell which is a primary cell.The function of performing standalone communication includes a functionnecessary for initial connection.

FIG. 2 is a diagram illustrating an example of setting of a componentcarrier according to the present embodiment. In the example of FIG. 2,two NR cells are set. The two NR cells are set as a primary cell and asecondary cell, respectively, and are integrated by carrier aggregation.In this case, when the NR cell supports the function of performingstandalone communication, assist of the LTE cell is not necessary. Notethat the two NR cells may be integrated by dual connectivity.

<Radio Frame Configuration in Present Embodiment>

In the present embodiment, a radio frame configured with 10 ms(milliseconds) is specified. Each radio frame includes two half frames.A time interval of the half frame is 5 ms. Each half frame includes 5sub frames. The time interval of the sub frame is 1 ms and is defined bytwo successive slots. The time interval of the slot is 0.5 ms. An i-thsub frame in the radio frame includes a (2×i)-th slot and a (2×i+1)-thslot. In other words, 10 sub frames are specified in each of the radioframes.

Sub frames include a downlink sub frame, an uplink sub frame, a specialsub frame, a sidelink sub frame, and the like.

The downlink sub frame is a sub frame reserved for downlinktransmission. The uplink sub frame is a sub frame reserved for uplinktransmission. The special sub frame includes three fields. The threefields are a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), andan Uplink Pilot Time Slot (UpPTS). A total length of DwPTS, GP, andUpPTS is 1 ms. The DwPTS is a field reserved for downlink transmission.The UpPTS is a field reserved for uplink transmission. The GP is a fieldin which downlink transmission and uplink transmission are notperformed. Further, the special sub frame may include only the DwPTS andthe GP or may include only the GP and the UpPTS. The special sub frameis placed between the downlink sub frame and the uplink sub frame in TDDand used to perform switching from the downlink sub frame to the uplinksub frame. The sidelink sub frame is a sub frame reserved or set forsidelink communication. The sidelink is used for contiguous directcommunication and contiguous direct detection between terminal devices.

A single radio frame includes a downlink sub frame, an uplink sub frame,a special sub frame, and/or a sidelink sub frame. Further, a singleradio frame includes only a downlink sub frame, an uplink sub frame, aspecial sub frame, or a sidelink sub frame.

A plurality of radio frame configurations are supported. The radio frameconfiguration is specified by the frame configuration type. The frameconfiguration type 1 can be applied only to FDD. The frame configurationtype 2 can be applied only to TDD. The frame configuration type 3 can beapplied only to an operation of a licensed assisted access (LAA)secondary cell.

In the frame configuration type 2, a plurality of uplink-downlinkconfigurations are specified. In the uplink-downlink configuration, eachof 10 sub frames in one radio frame corresponds to one of the downlinksub frame, the uplink sub frame, and the special sub frame. The subframe 0, the sub frame 5 and the DwPTS are constantly reserved fordownlink transmission. The UpPTS and the sub frame just after thespecial sub frame are constantly reserved for uplink transmission.

In the frame configuration type 3, 10 sub frames in one radio frame arereserved for downlink transmission. The terminal device 2 treats eachsub frame as an empty sub frame. Unless a predetermined signal, channeland/or downlink transmission is detected in a certain sub frame, theterminal device 2 assumes that there is no signal and/or channel in thesub frame. The downlink transmission is exclusively occupied by one ormore consecutive sub frames. The first sub frame of the downlinktransmission may be started from any one in that sub frame. The last subframe of the downlink transmission may be either completely exclusivelyoccupied or exclusively occupied by a time interval specified in theDwPTS.

Further, in the frame configuration type 3, 10 sub frames in one radioframe may be reserved for uplink transmission. Further, each of 10 subframes in one radio frame may correspond to any one of the downlink subframe, the uplink sub frame, the special sub frame, and the sidelink subframe.

The base station device 1 may transmit a physical downlink channel and aphysical downlink signal in the DwPTS of the special sub frame. The basestation device 1 can restrict transmission of the PBCH in the DwPTS ofthe special sub frame. The terminal device 2 may transmit physicaluplink channels and physical uplink signals in the UpPTS of the specialsub frame. The terminal device 2 can restrict transmission of some ofthe physical uplink channels and the physical uplink signals in theUpPTS of the special sub frame.

<Frame Configuration of LTE in Present Embodiment>

FIG. 3 is a diagram illustrating an example of a downlink sub frame ofLTE according to the present embodiment. The diagram illustrated in FIG.3 is referred to as a downlink resource grid of LTE. The base stationdevice 1 can transmit a physical downlink channel of LTE and/or aphysical downlink signal of LTE in a downlink sub frame to the terminaldevice 2. The terminal device 2 can receive a physical downlink channelof LTE and/or a physical downlink signal of LTE in a downlink sub framefrom the base station device 1.

FIG. 4 is a diagram illustrating an example of an uplink sub frame ofLTE according to the present embodiment. The diagram illustrated in FIG.4 is referred to as an uplink resource grid of LTE. The terminal device2 can transmit a physical uplink channel of LTE and/or a physical uplinksignal of LTE in an uplink sub frame to the base station device 1. Thebase station device 1 can receive a physical uplink channel of LTEand/or a physical uplink signal of LTE in an uplink sub frame from theterminal device 2.

In the present embodiment, the LTE physical resources can be defined asfollows. One slot is defined by a plurality of symbols. The physicalsignal or the physical channel transmitted in each of the slots isrepresented by a resource grid. In the downlink, the resource grid isdefined by a plurality of sub carriers in a frequency direction and aplurality of OFDM symbols in a time direction. In the uplink, theresource grid is defined by a plurality of sub carriers in the frequencydirection and a plurality of SC-FDMA symbols in the time direction. Thenumber of sub carriers or the number of resource blocks may be decideddepending on a bandwidth of a cell. The number of symbols in one slot isdecided by a type of cyclic prefix (CP). The type of CP is a normal CPor an extended CP. In the normal CP, the number of OFDM symbols orSC-FDMA symbols constituting one slot is 7. In the extended CP, thenumber of OFDM symbols or SC-FDMA symbols constituting one slot is 6.Each element in the resource grid is referred to as a resource element.The resource element is identified using an index (number) of a subcarrier and an index (number) of a symbol. Further, in the descriptionof the present embodiment, the OFDM symbol or SC-FDMA symbol is alsoreferred to simply as a symbol.

The resource blocks are used for mapping a certain physical channel (thePDSCH, the PUSCH, or the like) to resource elements. The resource blocksinclude virtual resource blocks and physical resource blocks. A certainphysical channel is mapped to a virtual resource block. The virtualresource blocks are mapped to physical resource blocks. One physicalresource block is defined by a predetermined number of consecutivesymbols in the time domain. One physical resource block is defined froma predetermined number of consecutive sub carriers in the frequencydomain. The number of symbols and the number of sub carriers in onephysical resource block are decided on the basis of a parameter set inaccordance with a type of CP, a sub carrier interval, and/or a higherlayer in the cell. For example, in a case in which the type of CP is thenormal CP, and the sub carrier interval is 15 kHz, the number of symbolsin one physical resource block is 7, and the number of sub carriers is12. In this case, one physical resource block includes (7×12) resourceelements. The physical resource blocks are numbered from 0 in thefrequency domain. Further, two resource blocks in one sub framecorresponding to the same physical resource block number are defined asa physical resource block pair (a PRB pair or an RB pair).

In each LTE cell, one predetermined parameter is used in a certain subframe. For example, the predetermined parameter is a parameter relatedto a transmission signal. Parameters related to the transmission signalinclude a CP length, a sub carrier interval, the number of symbols inone sub frame (predetermined time length), the number of sub carriers inone resource block (predetermined frequency band), a multiple accessscheme, a signal waveform, and the like.

That is, In the LTE cell, a downlink signal and an uplink signal areeach generated using one predetermined parameter in a predetermined timelength (for example, a sub frame). In other words, in the terminaldevice 2, it is assumed that a downlink signal to be transmitted fromthe base station device 1 and an uplink signal to be transmitted to thebase station device 1 are each generated with a predetermined timelength with one predetermined parameter. Further, the base stationdevice 1 is set such that a downlink signal to be transmitted to theterminal device 2 and an uplink signal to be transmitted from theterminal device 2 are each generated with a predetermined time lengthwith one predetermined parameter.

<Frame Configuration of NR in Present Embodiment>

In each NR cell, one or more predetermined parameters are used in acertain predetermined time length (for example, a sub frame). That is,in the NR cell, a downlink signal and an uplink signal are eachgenerated using or more predetermined parameters in a predetermined timelength. In other words, in the terminal device 2, it is assumed that adownlink signal to be transmitted from the base station device 1 and anuplink signal to be transmitted to the base station device 1 are eachgenerated with one or more predetermined parameters in a predeterminedtime length. Further, the base station device 1 is set such that adownlink signal to be transmitted to the terminal device 2 and an uplinksignal to be transmitted from the terminal device 2 are each generatedwith a predetermined time length using one or more predeterminedparameters. In a case in which the plurality of predetermined parametersare used, a signal generated using the predetermined parameters ismultiplexed in accordance with a predetermined method. For example, thepredetermined method includes Frequency Division Multiplexing (FDM),Time Division Multiplexing (TDM), Code Division Multiplexing (CDM),and/or Spatial Division Multiplexing (SDM).

In a combination of the predetermined parameters set in the NR cell, aplurality of kinds of parameter sets can be specified in advance.

FIG. 5 is a diagram illustrating examples of the parameter sets relatedto a transmission signal in the NR cell. In the example of FIG. 5,parameters of the transmission signal included in the parameter setsinclude a sub carrier interval, the number of sub carriers per resourceblock in the NR cell, the number of symbols per sub frame, and a CPlength type. The CP length type is a type of CP length used in the NRcell. For example, CP length type 1 is equivalent to a normal CP in LTEand CP length type 2 is equivalent to an extended CP in LTE.

The parameter sets related to a transmission signal in the NR cell canbe specified individually with a downlink and an uplink. Further, theparameter sets related to a transmission signal in the NR cell can beset independently with a downlink and an uplink.

FIG. 6 is a diagram illustrating an example of an NR downlink sub frameof the present embodiment. In the example of FIG. 6, signals generatedusing parameter set 1, parameter set 0, and parameter set 2 aresubjected to FDM in a cell (system bandwidth). The diagram illustratedin FIG. 6 is also referred to as a downlink resource grid of NR. Thebase station device 1 can transmit the physical downlink channel of NRand/or the physical downlink signal of NR in a downlink sub frame to theterminal device 2. The terminal device 2 can receive a physical downlinkchannel of NR and/or the physical downlink signal of NR in a downlinksub frame from the base station device 1.

FIG. 7 is a diagram illustrating an example of an NR uplink sub frame ofthe present embodiment. In the example of FIG. 7, signals generatedusing parameter set 1, parameter set 0, and parameter set 2 aresubjected to FDM in a cell (system bandwidth). The diagram illustratedin FIG. 6 is also referred to as an uplink resource grid of NR. The basestation device 1 can transmit the physical uplink channel of NR and/orthe physical uplink signal of NR in an uplink sub frame to the terminaldevice 2. The terminal device 2 can receive a physical uplink channel ofNR and/or the physical uplink signal of NR in an uplink sub frame fromthe base station device 1.

<Antenna Port in Present Embodiment>

An antenna port is defined so that a propagation channel carrying acertain symbol can be inferred from a propagation channel carryinganother symbol in the same antenna port. For example, different physicalresources in the same antenna port can be assumed to be transmittedthrough the same propagation channel. In other words, for a symbol in acertain antenna port, it is possible to estimate and demodulate apropagation channel in accordance with the reference signal in theantenna port. Further, there is one resource grid for each antenna port.The antenna port is defined by the reference signal. Further, eachreference signal can define a plurality of antenna ports.

The antenna port is specified or identified with an antenna port number.For example, antenna ports 0 to 3 are antenna ports with which CRS istransmitted. That is, the PDSCH transmitted with antenna ports 0 to 3can be demodulated to CRS corresponding to antenna ports 0 to 3.

In a case in which two antenna ports satisfy a predetermined condition,the two antenna ports can be regarded as being a quasi co-location(QCL). The predetermined condition is that a wide area characteristic ofa propagation channel carrying a symbol in one antenna port can beinferred from a propagation channel carrying a symbol in another antennaport. The wide area characteristic includes a delay dispersion, aDoppler spread, a Doppler shift, an average gain, and/or an averagedelay.

In the present embodiment, the antenna port numbers may be defineddifferently for each RAT or may be defined commonly between RATs. Forexample, antenna ports 0 to 3 in LTE are antenna ports with which CRS istransmitted. In the NR, antenna ports 0 to 3 can be set as antenna portswith which CRS similar to that of LTE is transmitted. Further, in NR,the antenna ports with which CRS is transmitted like LTE can be set asdifferent antenna port numbers from antenna ports 0 to 3. In thedescription of the present embodiment, predetermined antenna portnumbers can be applied to LTE and/or NR.

<Physical Channel and Physical Signal in Present Embodiment>

In the present embodiment, physical channels and physical signals areused.

The physical channels include a physical downlink channel, a physicaluplink channel, and a physical sidelink channel. The physical signalsinclude a physical downlink signal, a physical uplink signal, and asidelink physical signal.

In LTE, a physical channel and a physical signal are referred to as anLTE physical channel and an LTE physical signal. In NR, a physicalchannel and a physical signal are referred to as an NR physical channeland an NR physical signal. The LTE physical channel and the NR physicalchannel can be defined as different physical channels, respectively. TheLTE physical signal and the NR physical signal can be defined asdifferent physical signals, respectively. In the description of thepresent embodiment, the LTE physical channel and the NR physical channelare also simply referred to as physical channels, and the LTE physicalsignal and the NR physical signal are also simply referred to asphysical signals. That is, the description of the physical channels canbe applied to any of the LTE physical channel and the NR physicalchannel. The description of the physical signals can be applied to anyof the LTE physical signal and the NR physical signal.

The physical downlink channel includes a Physical Broadcast Channel(PBCH), a Physical Control Format Indicator Channel (PCFICH), a PhysicalHybrid automatic repeat request Indicator Channel (PHICH), a PhysicalDownlink Control Channel (PDCCH), an Enhanced PDCCH (EPDCCH), a MachineType Communication (MTC) PDCCH (MTC MPDCCH), a Relay PDCCH (R-PDCCH), aPhysical Downlink Shared Channel (PDSCH), a Physical Multicast Channel(PMCH), and the like.

The physical downlink signal includes a Synchronization Signal (SS), aDownlink Reference Signal (DL-RS), a Discovery Signal (DS), and thelike.

The synchronization signal includes a primary synchronization signal(PSS), a secondary synchronization signal (SSS), and the like.

The reference signal in the downlink includes a cell-specific referencesignal (CRS), a UE-specific reference signal associated with the PDSCH(PDSCH-DMRS), a demodulation reference signal associated with the EPDCCH(EPDCCH-DMRS), a positioning reference signal (PRS), a channel stateinformation (CSI) reference signal (CSI-RS), a tracking reference signal(TRS), and the like. The PDSCH-DMRS is also referred to as a URSassociated with the PDSCH or referred to simply as a URS. TheEPDCCH-DMRS is also referred to as a DMRS associated with the EPDCCH orreferred to simply as DMRS. The PDSCH-DMRS and the EPDCCH-DMRS are alsoreferred to simply as a DL-DMRS or a downlink demodulation referencesignal. The CSI-RS includes a non-zero power CSI-RS (NZP CSI-RS).Further, the downlink resources include a zero power CSI-RS (ZP CSI-RS),a channel state information-interference measurement (CSI-IM), and thelike.

The physical uplink channel includes a physical uplink shared channel(PUSCH), a physical uplink control channel (PUCCH), a physical randomaccess channel (PRACH), and the like.

The physical uplink signal includes an uplink reference signal (UL-RS).

The uplink reference signal includes an uplink demodulation signal(UL-DMRS), a sounding reference signal (SRS), and the like. The UL-DMRSis associated with transmission of the PUSCH or the PUCCH. The SRS isnot associated with transmission of the PUSCH or the PUCCH.

The physical sidelink channel includes a Physical Sidelink BroadcastChannel (PSBCH), a Physical Sidelink Control Channel (PSCCH), a PhysicalSidelink Discovery Channel (PSDCH), a Physical Sidelink Shared Channel(PSSCH), and the like.

The physical channel and the physical signal are also simply referred toa channel and a signal. That is, the physical downlink channel, thephysical uplink channel, and the physical sidelink channel are alsoreferred to as a downlink channel, an uplink channel, and a sidelinkchannel, respectively. The physical downlink signal, the physical uplinksignal, and the physical sidelink signal are also referred to as adownlink signal, an uplink signal, and a sidelink signal, respectively.

The BCH, the MCH, the UL-SCH, and the DL-SCH are transport channels. Thechannel used in the medium access control (MAC) layer is referred to asa transport channel. A unit of the transport channel used in the MAClayer is also referred to as a transport block (TB) or a MAC protocoldata unit (MAC PDU). In the MAC layer, control of a hybrid automaticrepeat request (HARD) is performed for each transport block. Thetransport block is a unit of data that the MAC layer transfers(delivers) to the physical layer. In the physical layer, the transportblock is mapped to a codeword, and an encoding process is performed foreach codeword.

Note that the downlink reference signal and the uplink reference signalare also simply referred to as reference signals (RSs).

<LTE Physical Channel and LTE Physical Signal in Present Embodiment>

As described above, the description of the physical channel and thephysical signal can also be applied to the LTE physical channel and theLTE physical signal, respectively. The LTE physical channel and the LTEphysical signal are referred to as the following.

The LTE physical downlink channel includes an LTE-PBCH, an LTE-PCFICH,an LTE-PHICH, an LTE-PDCCH, an LTE-EPDCCH, an LTE-MPDCCH, anLTE-R-PDCCH, an LTE-PDSCH, an LTE-PMCH, and the like.

The LTE physical downlink signal an LTE-SS, an LTE-DL-RS, an LTE-DS, andthe like. The LTE-SS includes an LTE-PSS, an LTE-SSS, and the like. TheLTE-RS includes an LTE-CRS, an LTE-PDSCH-DMRS, an LTE-EPDCCH-DMRS, anLTE-RRS, an LTE-CSI-RS, an LTE-TRS, and the like.

The LTE physical uplink channel includes an LTE-PUSCH, an LTE-PUCCH, anLTE-PRACH, and the like.

The LTE physical uplink signal includes an LTE-UL-RS. The LTE-UL-RSincludes an LTE-UL-DMRS, an LTE-SRS, and the like.

The LTE physical sidelink channel includes an LTE-PSBCH, an LTE-PSCCH,an LTE-PSDCH, an LTE-PSSCH, and the like.

<NR Physical Channel and NR Physical Signal in Present Embodiment>

As described above, the description of the physical channel and thephysical signal can also be applied to the NR physical channel and theNR physical signal, respectively. The NR physical channel and the NRphysical signal are referred to as the following.

The NR physical downlink channel includes an NR-PBCH, an NR-PCFICH, anNR-PHICH, an NR-PDCCH, an NR-EPDCCH, an NR-MPDCCH, an NR-R-PDCCH, anNR-PDSCH, an NR-PMCH, and the like.

The NR physical downlink signal includes an NR-SS, an NR-DL-RS, anNR-DS, and the like. The NR-SS includes an NR-PSS, an NR-SSS, and thelike. The NR-RS includes an NR-CRS, an NR-PDSCH-DMRS, an NR-EPDCCH-DMRS,an NR-PRS, an NR-CSI-RS, an NR-TRS, and the like.

The NR physical uplink channel includes an NR-PUSCH, an NR-PUCCH, anNR-PRACH, and the like.

The NR physical uplink signal includes an NR-UL-RS. The NR-UL-RSincludes an NR-UL-DMRS, an NR-SRS, and the like.

The NR physical sidelink channel includes an NR-PSBCH, an NR-PSCCH, anNR-PSDCH, an NR-PSSCH, and the like.

<Physical Downlink Channel in Present Embodiment>

The PBCH is used to broadcast a master information block (MIB) which isbroadcast information specific to a serving cell of the base stationdevice 1. The PBCH is transmitted only through the sub frame 0 in theradio frame. The MIB can be updated at intervals of 40 ms. The PBCH isrepeatedly transmitted with a cycle of 10 ms. Specifically, initialtransmission of the MIB is performed in the sub frame 0 in the radioframe satisfying a condition that a remainder obtained by dividing asystem frame number (SFN) by 4 is 0, and retransmission (repetition) ofthe MIB is performed in the sub frame 0 in all the other radio frames.The SFN is a radio frame number (system frame number). The MIB is systeminformation. For example, the MIB includes information indicating theSFN.

The PCFICH is used to transmit information related to the number of OFDMsymbols used for transmission of the PDCCH. A region indicated by PCFICHis also referred to as a PDCCH region. The information transmittedthrough the PCFICH is also referred to as a control format indicator(CFI).

The PHICH is used to transmit an HARQ-ACK (an HARQ indicator, HARQfeedback, and response information) indicating ACKnowledgment (ACK) ornegative ACKnowledgment (NACK) of uplink data (an uplink shared channel(UL-SCH)) received by the base station device 1. For example, in a casein which the HARQ-ACK indicating ACK is received, corresponding uplinkdata is not retransmitted. For example, in a case in which the terminaldevice 2 receives the HARQ-ACK indicating NACK, the terminal device 2retransmits corresponding uplink data through a predetermined uplink subframe. A certain PHICH transmits the HARQ-ACK for certain uplink data.The base station device 1 transmits each HARQ-ACK to a plurality ofpieces of uplink data included in the same PUSCH using a plurality ofPHICHs.

The PDCCH and the EPDCCH are used to transmit downlink controlinformation (DCI). Mapping of an information bit of the downlink controlinformation is defined as a DCI format. The downlink control informationincludes a downlink grant and an uplink grant. The downlink grant isalso referred to as a downlink assignment or a downlink allocation.

The PDCCH is transmitted by a set of one or more consecutive controlchannel elements (CCEs). The CCE includes 9 resource element groups(REGs). An REG includes 4 resource elements. In a case in which thePDCCH is constituted by n consecutive CCEs, the PDCCH starts with a CCEsatisfying a condition that a remainder after dividing an index (number)i of the CCE by n is 0.

The EPDCCH is transmitted by a set of one or more consecutive enhancedcontrol channel elements (ECCEs). The ECCE is constituted by a pluralityof enhanced resource element groups (EREGs).

The downlink grant is used for scheduling of the PDSCH in a certaincell. The downlink grant is used for scheduling of the PDSCH in the samesub frame as a sub frame in which the downlink grant is transmitted. Theuplink grant is used for scheduling of the PUSCH in a certain cell. Theuplink grant is used for scheduling of a single PUSCH in a fourth subframe from a sub frame in which the uplink grant is transmitted orlater.

A cyclic redundancy check (CRC) parity bit is added to the DCI. The CRCparity bit is scrambled using a radio network temporary identifier(RNTI). The RNTI is an identifier that can be specified or set inaccordance with a purpose of the DCI or the like. The RNTI is anidentifier specified in a specification in advance, an identifier set asinformation specific to a cell, an identifier set as informationspecific to the terminal device 2, or an identifier set as informationspecific to a group to which the terminal device 2 belongs. For example,in monitoring of the PDCCH or the EPDCCH, the terminal device 2descrambles the CRC parity bit added to the DCI with a predeterminedRNTI and identifies whether or not the CRC is correct. In a case inwhich the CRC is correct, the DCI is understood to be a DCI for theterminal device 2.

The PDSCH is used to transmit downlink data (a downlink shared channel(DL-SCH)). Further, the PDSCH is also used to transmit controlinformation of a higher layer.

The PMCH is used to transmit multicast data (a multicast channel (MCH)).

In the PDCCH region, a plurality of PDCCHs may be multiplexed accordingto frequency, time, and/or space. In the EPDCCH region, a plurality ofEPDCCHs may be multiplexed according to frequency, time, and/or space.In the PDSCH region, a plurality of PDSCHs may be multiplexed accordingto frequency, time, and/or space. The PDCCH, the PDSCH, and/or theEPDCCH may be multiplexed according to frequency, time, and/or space.

<Physical Downlink Signal in Present Embodiment>

A synchronization signal is used for the terminal device 2 to obtaindownlink synchronization in the frequency domain and/or the time domain.The synchronization signal includes a primary synchronization signal(PSS) and a secondary synchronization signal (SSS). The synchronizationsignal is placed in a predetermined sub frame in the radio frame. Forexample, in the TDD scheme, the synchronization signal is placed in thesub frames 0, 1, 5, and 6 in the radio frame. In the FDD scheme, thesynchronization signal is placed in the sub frames 0 and 5 in the radioframe.

The PSS may be used for coarse frame/timing synchronization(synchronization in the time domain) or cell group identification. TheSSS may be used for more accurate frame timing synchronization or cellidentification. In other words, frame timing synchronization and cellidentification can be performed using the PSS and the SSS.

The downlink reference signal is used for the terminal device 2 toperform propagation path estimation of the physical downlink channel,propagation path correction, calculation of downlink channel stateinformation (CSI), and/or measurement of positioning of the terminaldevice 2.

The CRS is transmitted in the entire band of the sub frame. The CRS isused for receiving (demodulating) the PBCH, the PDCCH, the PHICH, thePCFICH, and the PDSCH. The CRS may be used for the terminal device 2 tocalculate the downlink channel state information. The PBCH, the PDCCH,the PHICH, and the PCFICH are transmitted through the antenna port usedfor transmission of the CRS. The CRS supports the antenna portconfigurations of 1, 2, or 4. The CRS is transmitted through one or moreof the antenna ports 0 to 3.

The URS associated with the PDSCH is transmitted through a sub frame anda band used for transmission of the PDSCH with which the URS isassociated. The URS is used for demodulation of the PDSCH to which theURS is associated. The URS associated with the PDSCH is transmittedthrough one or more of the antenna ports 5 and 7 to 14.

The PDSCH is transmitted through an antenna port used for transmissionof the CRS or the URS on the basis of the transmission mode and the DCIformat. A DCI format 1A is used for scheduling of the PDSCH transmittedthrough an antenna port used for transmission of the CRS. A DCI format2D is used for scheduling of the PDSCH transmitted through an antennaport used for transmission of the URS.

The DMRS associated with the EPDCCH is transmitted through a sub frameand a band used for transmission of the EPDCCH to which the DMRS isassociated. The DMRS is used for demodulation of the EPDCCH with whichthe DMRS is associated. The EPDCCH is transmitted through an antennaport used for transmission of the DMRS. The DMRS associated with theEPDCCH is transmitted through one or more of the antenna ports 107 to114.

The CSI-RS is transmitted through a set sub frame.

The resources in which the CSI-RS is transmitted are set by the basestation device 1. The CSI-RS is used for the terminal device 2 tocalculate the downlink channel state information. The terminal device 2performs signal measurement (channel measurement) using the CSI-RS. TheCSI-RS supports setting of some or all of the antenna ports 1, 2, 4, 8,12, 16, 24, and 32. The CSI-RS is transmitted through one or more of theantenna ports 15 to 46. Further, an antenna port to be supported may bedecided on the basis of a terminal device capability of the terminaldevice 2, setting of an RRC parameter, and/or a transmission mode to beset.

Resources of the ZP CSI-RS are set by a higher layer. Resources of theZP CSI-RS are transmitted with zero output power. In other words, theresources of the ZP CSI-RS are not transmitted. The ZP PDSCH and theEPDCCH are not transmitted in the resources in which the ZP CSI-RS isset. For example, the resources of the ZP CSI-RS are used for a neighborcell to transmit the NZP CSI-RS. Further, for example, the resources ofthe ZP CSI-RS are used to measure the CSI-IM. Further, for example, theresources of the ZP CSI-RS are resources with which a predeterminedchannel such as the PDSCH is not transmitted. In other words, thepredetermined channel is mapped (to be rate-matched or punctured) exceptfor the resources of the ZP CSI-RS.

Resources of the CSI-IM are set by the base station device 1. Theresources of the CSI-IM are resources used for measuring interference inCSI measurement. The resources of the CSI-IM can be set to overlap someof the resources of the ZP CSI-RS. For example, in a case in which theresources of the CSI-IM are set to overlap some of the resources of theZP CSI-RS, a signal from a cell performing the CSI measurement is nottransmitted in the resources. In other words, the base station device 1does not transmit the PDSCH, the EPDCCH, or the like in the resourcesset by the CSI-IM. Therefore, the terminal device 2 can perform the CSImeasurement efficiently.

The MBSFN RS is transmitted in the entire band of the sub frame used fortransmission of the PMCH. The MBSFN RS is used for demodulation of thePMCH. The PMCH is transmitted through an antenna port used fortransmission of the MBSFN RS. The MBSFN RS is transmitted through theantenna port 4.

The PRS is used for the terminal device 2 to measure positioning of theterminal device 2. The PRS is transmitted through the antenna port 6.

The TRS can be mapped only to predetermined sub frames. For example, theTRS is mapped to the sub frames 0 and 5. Further, the TRS can use aconfiguration similar to a part or all of the CRS. For example, in eachresource block, a position of a resource element to which the TRS ismapped can be caused to coincide with a position of a resource elementto which the CRS of the antenna port 0 is mapped. Further, a sequence(value) used for the TRS can be decided on the basis of information setthrough the PBCH, the PDCCH, the EPDCCH, or the PDSCH (RRC signaling). Asequence (value) used for the TRS can be decided on the basis of aparameter such as a cell ID (for example, a physical layer cellidentifier), a slot number, or the like. A sequence (value) used for theTRS can be decided by a method (formula) different from that of asequence (value) used for the CRS of the antenna port 0.

<Physical Uplink Signal in Present Embodiment>

The PUCCH is a physical channel used for transmitting uplink controlinformation (UCI). The uplink control information includes downlinkchannel state information (CSI), a scheduling request (SR) indicating arequest for PUSCH resources, and a HARQ-ACK to downlink data (atransport block (TB) or a downlink-shared channel (DL-SCH)). TheHARQ-ACK is also referred to as ACK/NACK, HARQ feedback, or responseinformation. Further, the HARQ-ACK to downlink data indicates ACK, NACK,or DTX.

The PUSCH is a physical channel used for transmitting uplink data(uplink-shared channel (UL-SCH)). Further, the PUSCH may be used totransmit the HARQ-ACK and/or the channel state information together withuplink data. Further, the PUSCH may be used to transmit only the channelstate information or only the HARQ-ACK and the channel stateinformation.

The PRACH is a physical channel used for transmitting a random accesspreamble. The PRACH can be used for the terminal device 2 to obtainsynchronization in the time domain with the base station device 1.Further, the PRACH is also used to indicate an initial connectionestablishment procedure (process), a handover procedure, a connectionre-establishment procedure, synchronization (timing adjustment) foruplink transmission, and/or a request for PUSCH resources.

In the PUCCH region, a plurality of PUCCHs are frequency, time, space,and/or code multiplexed. In the PUSCH region, a plurality of PUSCHs maybe frequency, time, space, and/or code multiplexed. The PUCCH and thePUSCH may be frequency, time, space, and/or code multiplexed. The PRACHmay be placed over a single sub frame or two sub frames. A plurality ofPRACHs may be code-multiplexed.

<Physical Uplink Signal in Present Embodiment>

The uplink DMRS is associated with transmission of the PUSCH or thePUCCH. The DMRS is time-multiplexed with the PUSCH or the PUCCH. Thebase station device 1 may use the DMRS to perform the propagation pathcorrection of the PUSCH or the PUCCH. In the description of the presentembodiment, the transmission of the PUSCH also includes multiplexing andtransmitting the PUSCH and DMRS. In the description of the presentembodiment, the transmission of the PUCCH also includes multiplexing andtransmitting the PUCCH and the DMRS. Further, the uplink DMRS is alsoreferred to as an UL-DMRS. The SRS is not associated with thetransmission of the PUSCH or the PUCCH. The base station device 1 mayuse the SRS to measure the uplink channel state.

The SRS is transmitted using the last SC-FDMA symbol in the uplink subframe. In other words, the SRS is placed in the last SC-FDMA symbol inthe uplink sub frame. The terminal device 2 can restrict simultaneoustransmission of the SRS, the PUCCH, the PUSCH, and/or the PRACH in acertain SC-FDMA symbol of a certain cell. The terminal device 2 cantransmit the PUSCH and/or the PUCCH using the SC-FDMA symbol excludingthe last SC-FDMA symbol in a certain uplink sub frame of a certain cellin the uplink sub frame and transmit the SRS using the last SC-FDMAsymbol in the uplink sub frame. In other words, the terminal device 2can transmit the SRS, the PUSCH, and the PUCCH in a certain uplink subframe of a certain cell.

In the SRS, a trigger type 0 SRS and a trigger type 1 SRS are defined asSRSs having different trigger types. The trigger type 0 SRS istransmitted in a case in which a parameter related to the trigger type 0SRS is set by signaling of a higher layer. The trigger type 1 SRS istransmitted in a case in which a parameter related to the trigger type 1SRS is set by signaling of the higher layer, and transmission isrequested by an SRS request included in the DCI format 0, 1A, 2B, 2C,2D, or 4. Further, the SRS request is included in both FDD and TDD forthe DCI format 0, 1A, or 4 and included only in TDD for the DCI format2B, 2C, or 2D. In a case in which the transmission of the trigger type 0SRS and the transmission of the trigger type 1 SRS occur in the same subframe of the same serving cell, a priority is given to the transmissionof the trigger type 1 SRS.

<Physical Resources for Control Channel in Present Embodiment>

A resource element group (REG) is used to define mapping of the resourceelement and the control channel. For example, the REG is used formapping of the PDCCH, the PHICH, or the PCFICH. The REG is constitutedby four consecutive resource elements which are in the same OFDM symboland not used for the CRS in the same resource block. Further, the REG isconstituted by first to fourth OFDM symbols in a first slot in a certainsub frame.

An enhanced resource element group (EREG) is used to define mapping ofthe resource elements and the enhanced control channel. For example, theEREG is used for mapping of the EPDCCH. One resource block pair isconstituted by 16 EREGs. Each EREG is assigned a number of 0 to 15 foreach resource block pair. Each EREG is constituted by 9 resourceelements excluding resource elements used for the DM-RS associated withthe EPDCCH in one resource block pair.

<Configuration Example of Base Station Device 1 in Present Embodiment>

FIG. 8 is a schematic block diagram illustrating a configuration of thebase station device 1 of the present embodiment. As illustrated in FIG.3, the base station device 1 includes a higher layer processing unit101, a control unit 103, a receiving unit 105, a transmitting unit 107,and a transceiving antenna 109. Further, the receiving unit 105 includesa decoding unit 1051, a demodulating unit 1053, a demultiplexing unit1055, a wireless receiving unit 1057, and a channel measuring unit 1059.Further, the transmitting unit 107 includes an encoding unit 1071, amodulating unit 1073, a multiplexing unit 1075, a wireless transmittingunit 1077, and a downlink reference signal generating unit 1079.

As described above, the base station device 1 can support one or moreRATs. Some or all of the units included in the base station device 1illustrated in FIG. 8 can be configured individually in accordance withthe RAT. For example, the receiving unit 105 and the transmitting unit107 are configured individually in LTE and NR. Further, in the NR cell,some or all of the units included in the base station device 1illustrated in FIG. 8 can be configured individually in accordance witha parameter set related to the transmission signal. For example, in acertain NR cell, the wireless receiving unit 1057 and the wirelesstransmitting unit 1077 can be configured individually in accordance witha parameter set related to the transmission signal.

The higher layer processing unit 101 performs processes of a mediumaccess control (MAC) layer, a packet data convergence protocol (PDCP)layer, a radio link control (RLC) layer, and a radio resource control(RRC) layer. Further, the higher layer processing unit 101 generatescontrol information to control the receiving unit 105 and thetransmitting unit 107 and outputs the control information to the controlunit 103.

The control unit 103 controls the receiving unit 105 and thetransmitting unit 107 on the basis of the control information from thehigher layer processing unit 101. The control unit 103 generates controlinformation to be transmitted to the higher layer processing unit 101and outputs the control information to the higher layer processing unit101. The control unit 103 receives a decoded signal from the decodingunit 1051 and a channel estimation result from the channel measuringunit 1059. The control unit 103 outputs a signal to be encoded to theencoding unit 1071. Further, the control unit 103 is used to control thewhole or a part of the base station device 1.

The higher layer processing unit 101 performs a process and managementrelated to RAT control, radio resource control, sub frame setting,scheduling control, and/or CSI report control.

The process and the management in the higher layer processing unit 101are performed for each terminal device or in common to terminal devicesconnected to the base station device. The process and the management inthe higher layer processing unit 101 may be performed only by the higherlayer processing unit 101 or may be acquired from a higher node oranother base station device. Further, the process and the management inthe higher layer processing unit 101 may be individually performed inaccordance with the RAT. For example, the higher layer processing unit101 individually performs the process and the management in LTE and theprocess and the management in NR.

Under the RAT control of the higher layer processing unit 101,management related to the RAT is performed. For example, under the RATcontrol, the management related to LTE and/or the management related toNR is performed. The management related to NR includes setting and aprocess of a parameter set related to the transmission signal in the NRcell.

In the radio resource control in the higher layer processing unit 101,generation and/or management of downlink data (transport block), systeminformation, an RRC message (RRC parameter), and/or a MAC controlelement (CE) are performed.

In a sub frame setting in the higher layer processing unit 101,management of a sub frame setting, a sub frame pattern setting, anuplink-downlink setting, an uplink reference UL-DL setting, and/or adownlink reference UL-DL setting is performed. Further, the sub framesetting in the higher layer processing unit 101 is also referred to as abase station sub frame setting. Further, the sub frame setting in thehigher layer processing unit 101 can be decided on the basis of anuplink traffic volume and a downlink traffic volume. Further, the subframe setting in the higher layer processing unit 101 can be decided onthe basis of a scheduling result of scheduling control in the higherlayer processing unit 101.

In the scheduling control in the higher layer processing unit 101, afrequency and a sub frame to which the physical channel is allocated, acoding rate, a modulation scheme, and transmission power of the physicalchannels, and the like are decided on the basis of the received channelstate information, an estimation value, a channel quality, or the likeof a propagation path input from the channel measuring unit 1059, andthe like. For example, the control unit 103 generates the controlinformation (DCI format) on the basis of the scheduling result of thescheduling control in the higher layer processing unit 101.

In the CSI report control in the higher layer processing unit 101, theCSI report of the terminal device 2 is controlled. For example, asettings related to the CSI reference resources assumed to calculate theCSI in the terminal device 2 is controlled.

Under the control from the control unit 103, the receiving unit 105receives a signal transmitted from the terminal device 2 via thetransceiving antenna 109, performs a reception process such asdemultiplexing, demodulation, and decoding, and outputs informationwhich has undergone the reception process to the control unit 103.Further, the reception process in the receiving unit 105 is performed onthe basis of a setting which is specified in advance or a settingnotified from the base station device 1 to the terminal device 2.

The wireless receiving unit 1057 performs conversion into anintermediate frequency (down conversion), removal of an unnecessaryfrequency component, control of an amplification level such that asignal level is appropriately maintained, quadrature demodulation basedon an in-phase component and a quadrature component of a receivedsignal, conversion from an analog signal into a digital signal, removalof a guard interval (GI), and/or extraction of a signal in the frequencydomain by fast Fourier transform (FFT) on the uplink signal received viathe transceiving antenna 109.

The demultiplexing unit 1055 separates the uplink channel such as thePUCCH or the PUSCH and/or uplink reference signal from the signal inputfrom the wireless receiving unit 1057. The demultiplexing unit 1055outputs the uplink reference signal to the channel measuring unit 1059.The demultiplexing unit 1055 compensates the propagation path for theuplink channel from the estimation value of the propagation path inputfrom the channel measuring unit 1059.

The demodulating unit 1053 demodulates the reception signal for themodulation symbol of the uplink channel using a modulation scheme suchas binary phase shift keying (BPSK), quadrature phase shift keying(QPSK), 16 quadrature amplitude modulation (QAM), 64 QAM, or 256 QAM.The demodulating unit 1053 performs separation and demodulation of aMIMO multiplexed uplink channel.

The decoding unit 1051 performs a decoding process on encoded bits ofthe demodulated uplink channel. The decoded uplink data and/or uplinkcontrol information are output to the control unit 103. The decodingunit 1051 performs a decoding process on the PUSCH for each transportblock.

The channel measuring unit 1059 measures the estimation value, a channelquality, and/or the like of the propagation path from the uplinkreference signal input from the demultiplexing unit 1055, and outputsthe estimation value, a channel quality, and/or the like of thepropagation path to the demultiplexing unit 1055 and/or the control unit103. For example, the estimation value of the propagation path forpropagation path compensation for the PUCCH or the PUSCH is measuredthrough the UL-DMRS, and an uplink channel quality is measured throughthe SRS.

The transmitting unit 107 carries out a transmission process such asencoding, modulation, and multiplexing on downlink control informationand downlink data input from the higher layer processing unit 101 underthe control of the control unit 103. For example, the transmitting unit107 generates and multiplexes the PHICH, the PDCCH, the EPDCCH, thePDSCH, and the downlink reference signal and generates a transmissionsignal. Further, the transmission process in the transmitting unit 107is performed on the basis of a setting which is specified in advance, asetting notified from the base station device 1 to the terminal device2, or a setting notified through the PDCCH or the EPDCCH transmittedthrough the same sub frame.

The encoding unit 1071 encodes the HARQ indicator (HARQ-ACK), thedownlink control information, and the downlink data input from thecontrol unit 103 using a predetermined coding scheme such as blockcoding, convolutional coding, turbo coding, or the like. The modulatingunit 1073 modulates the encoded bits input from the encoding unit 1071using a predetermined modulation scheme such as BPSK, QPSK, 16 QAM, 64QAM, or 256 QAM. The downlink reference signal generating unit 1079generates the downlink reference signal on the basis of a physical cellidentification (PCI), an RRC parameter set in the terminal device 2, andthe like. The multiplexing unit 1075 multiplexes a modulated symbol andthe downlink reference signal of each channel and arranges resultingdata in a predetermined resource element.

The wireless transmitting unit 1077 performs processes such asconversion into a signal in the time domain by inverse fast Fouriertransform (IFFT), addition of the guard interval, generation of abaseband digital signal, conversion in an analog signal, quadraturemodulation, conversion from a signal of an intermediate frequency into asignal of a high frequency (up conversion), removal of an extrafrequency component, and amplification of power on the signal from themultiplexing unit 1075, and generates a transmission signal. Thetransmission signal output from the wireless transmitting unit 1077 istransmitted through the transceiving antenna 109.

<Configuration Example of Base Station Device 1 in Present Embodiment>

FIG. 9 is a schematic block diagram illustrating a configuration of theterminal device 2 of the present embodiment. As illustrated in FIG. 4,the terminal device 2 includes a higher layer processing unit 201, acontrol unit 203, a receiving unit 205, a transmitting unit 207, and atransceiving antenna 209. Further, the receiving unit 205 includes adecoding unit 2051, a demodulating unit 2053, a demultiplexing unit2055, a wireless receiving unit 2057, and a channel measuring unit 2059.Further, the transmitting unit 207 includes an encoding unit 2071, amodulating unit 2073, a multiplexing unit 2075, a wireless transmittingunit 2077, and an uplink reference signal generating unit 2079.

As described above, the terminal device 2 can support one or more RATs.Some or all of the units included in the terminal device 2 illustratedin FIG. 9 can be configured individually in accordance with the RAT. Forexample, the receiving unit 205 and the transmitting unit 207 areconfigured individually in LTE and NR. Further, in the NR cell, some orall of the units included in the terminal device 2 illustrated in FIG. 9can be configured individually in accordance with a parameter setrelated to the transmission signal. For example, in a certain NR cell,the wireless receiving unit 2057 and the wireless transmitting unit 2077can be configured individually in accordance with a parameter setrelated to the transmission signal.

The higher layer processing unit 201 outputs uplink data (transportblock) to the control unit 203. The higher layer processing unit 201performs processes of a medium access control (MAC) layer, a packet dataconvergence protocol (PDCP) layer, a radio link control (RLC) layer, anda radio resource control (RRC) layer. Further, the higher layerprocessing unit 201 generates control information to control thereceiving unit 205 and the transmitting unit 207 and outputs the controlinformation to the control unit 203.

The control unit 203 controls the receiving unit 205 and thetransmitting unit 207 on the basis of the control information from thehigher layer processing unit 201. The control unit 203 generates controlinformation to be transmitted to the higher layer processing unit 201and outputs the control information to the higher layer processing unit201. The control unit 203 receives a decoded signal from the decodingunit 2051 and a channel estimation result from the channel measuringunit 2059. The control unit 203 outputs a signal to be encoded to theencoding unit 2071. Further, the control unit 203 may be used to controlthe whole or a part of the terminal device 2.

The higher layer processing unit 201 performs a process and managementrelated to RAT control, radio resource control, sub frame setting,scheduling control, and/or CSI report control. The process and themanagement in the higher layer processing unit 201 are performed on thebasis of a setting which is specified in advance and/or a setting basedon control information set or notified from the base station device 1.For example, the control information from the base station device 1includes the RRC parameter, the MAC control element, or the DCI.Further, the process and the management in the higher layer processingunit 201 may be individually performed in accordance with the RAT. Forexample, the higher layer processing unit 201 individually performs theprocess and the management in LTE and the process and the management inNR.

Under the RAT control of the higher layer processing unit 201,management related to the RAT is performed. For example, under the RATcontrol, the management related to LTE and/or the management related toNR is performed. The management related to NR includes setting and aprocess of a parameter set related to the transmission signal in the NRcell.

In the radio resource control in the higher layer processing unit 201,the setting information in the terminal device 2 is managed. In theradio resource control in the higher layer processing unit 201,generation and/or management of uplink data (transport block), systeminformation, an RRC message (RRC parameter), and/or a MAC controlelement (CE) are performed.

In the sub frame setting in the higher layer processing unit 201, thesub frame setting in the base station device 1 and/or a base stationdevice different from the base station device 1 is managed. The subframe setting includes an uplink or downlink setting for the sub frame,a sub frame pattern setting, an uplink-downlink setting, an uplinkreference UL-DL setting, and/or a downlink reference UL-DL setting.Further, the sub frame setting in the higher layer processing unit 201is also referred to as a terminal sub frame setting.

In the scheduling control in the higher layer processing unit 201,control information for controlling scheduling on the receiving unit 205and the transmitting unit 207 is generated on the basis of the DCI(scheduling information) from the base station device 1.

In the CSI report control in the higher layer processing unit 201,control related to the report of the CSI to the base station device 1 isperformed. For example, in the CSI report control, a setting related tothe CSI reference resources assumed for calculating the CSI by thechannel measuring unit 2059 is controlled. In the CSI report control,resource (timing) used for reporting the CSI is controlled on the basisof the DCI and/or the RRC parameter.

Under the control from the control unit 203, the receiving unit 205receives a signal transmitted from the base station device 1 via thetransceiving antenna 209, performs a reception process such asdemultiplexing, demodulation, and decoding, and outputs informationwhich has undergone the reception process to the control unit 203.Further, the reception process in the receiving unit 205 is performed onthe basis of a setting which is specified in advance or a notificationfrom the base station device 1 or a setting.

The wireless receiving unit 2057 performs conversion into anintermediate frequency (down conversion), removal of an unnecessaryfrequency component, control of an amplification level such that asignal level is appropriately maintained, quadrature demodulation basedon an in-phase component and a quadrature component of a receivedsignal, conversion from an analog signal into a digital signal, removalof a guard interval (GI), and/or extraction of a signal in the frequencydomain by fast Fourier transform (FFT) on the uplink signal received viathe transceiving antenna 209.

The demultiplexing unit 2055 separates the downlink channel such as thePHICH, PDCCH, EPDCCH, or PDSCH, downlink synchronization signal and/ordownlink reference signal from the signal input from the wirelessreceiving unit 2057. The demultiplexing unit 2055 outputs the uplinkreference signal to the channel measuring unit 2059. The demultiplexingunit 2055 compensates the propagation path for the uplink channel fromthe estimation value of the propagation path input from the channelmeasuring unit 2059.

The demodulating unit 2053 demodulates the reception signal for themodulation symbol of the downlink channel using a modulation scheme suchas BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. The demodulating unit 2053performs separation and demodulation of a MIMO multiplexed downlinkchannel.

The decoding unit 2051 performs a decoding process on encoded bits ofthe demodulated downlink channel. The decoded downlink data and/ordownlink control information are output to the control unit 203. Thedecoding unit 2051 performs a decoding process on the PDSCH for eachtransport block.

The channel measuring unit 2059 measures the estimation value, a channelquality, and/or the like of the propagation path from the downlinkreference signal input from the demultiplexing unit 2055, and outputsthe estimation value, a channel quality, and/or the like of thepropagation path to the demultiplexing unit 2055 and/or the control unit203. The downlink reference signal used for measurement by the channelmeasuring unit 2059 may be decided on the basis of at least atransmission mode set by the RRC parameter and/or other RRC parameters.For example, the estimation value of the propagation path for performingthe propagation path compensation on the PDSCH or the EPDCCH is measuredthrough the DL-DMRS. The estimation value of the propagation path forperforming the propagation path compensation on the PDCCH or the PDSCHand/or the downlink channel for reporting the CSI are measured throughthe CRS. The downlink channel for reporting the CSI is measured throughthe CSI-RS. The channel measuring unit 2059 calculates a referencesignal received power (RSRP) and/or a reference signal received quality(RSRQ) on the basis of the CRS, the CSI-RS, or the discovery signal, andoutputs the RSRP and/or the RSRQ to the higher layer processing unit201.

The transmitting unit 207 performs a transmission process such asencoding, modulation, and multiplexing on the uplink control informationand the uplink data input from the higher layer processing unit 201under the control of the control unit 203. For example, the transmittingunit 207 generates and multiplexes the uplink channel such as the PUSCHor the PUCCH and/or the uplink reference signal, and generates atransmission signal. Further, the transmission process in thetransmitting unit 207 is performed on the basis of a setting which isspecified in advance or a setting set or notified from the base stationdevice 1.

The encoding unit 2071 encodes the HARQ indicator (HARQ-ACK), the uplinkcontrol information, and the uplink data input from the control unit 203using a predetermined coding scheme such as block coding, convolutionalcoding, turbo coding, or the like. The modulating unit 2073 modulatesthe encoded bits input from the encoding unit 2071 using a predeterminedmodulation scheme such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. Theuplink reference signal generating unit 2079 generates the uplinkreference signal on the basis of an RRC parameter set in the terminaldevice 2, and the like. The multiplexing unit 2075 multiplexes amodulated symbol and the uplink reference signal of each channel andarranges resulting data in a predetermined resource element.

The wireless transmitting unit 2077 performs processes such asconversion into a signal in the time domain by inverse fast Fouriertransform (IFFT), addition of the guard interval, generation of abaseband digital signal, conversion in an analog signal, quadraturemodulation, conversion from a signal of an intermediate frequency into asignal of a high frequency (up conversion), removal of an extrafrequency component, and amplification of power on the signal from themultiplexing unit 2075, and generates a transmission signal. Thetransmission signal output from the wireless transmitting unit 2077 istransmitted through the transceiving antenna 209.

<Signaling of Control Information in Present Embodiment>

The base station device 1 and the terminal device 2 can use variousmethods for signaling (notification, broadcasting, or setting) of thecontrol information. The signaling of the control information can beperformed in various layers (layers). The signaling of the controlinformation includes signaling of the physical layer which is signalingperformed through the physical layer, RRC signaling which is signalingperformed through the RRC layer, and MAC signaling which is signalingperformed through the MAC layer. The RRC signaling is dedicated RRCsignaling for notifying the terminal device 2 of the control informationspecific or a common RRC signaling for notifying of the controlinformation specific to the base station device 1. The signaling used bya layer higher than the physical layer such as RRC signaling and MACsignaling is also referred to as signaling of the higher layer.

The RRC signaling is implemented by signaling the RRC parameter. The MACsignaling is implemented by signaling the MAC control element. Thesignaling of the physical layer is implemented by signaling the downlinkcontrol information (DCI) or the uplink control information (UCI). TheRRC parameter and the MAC control element are transmitted using thePDSCH or the PUSCH. The DCI is transmitted using the PDCCH or theEPDCCH. The UCI is transmitted using the PUCCH or the PUSCH. The RRCsignaling and the MAC signaling are used for signaling semi-staticcontrol information and are also referred to as semi-static signaling.The signaling of the physical layer is used for signaling dynamiccontrol information and also referred to as dynamic signaling. The DCIis used for scheduling of the PDSCH or scheduling of the PUSCH. The UCIis used for the CSI report, the HARQ-ACK report, and/or the schedulingrequest (SR).

<Details of Downlink Control Information in Present Embodiment>

The DCI is notified using the DCI format having a field which isspecified in advance. Predetermined information bits are mapped to thefield specified in the DCI format. The DCI notifies of downlinkscheduling information, uplink scheduling information, sidelinkscheduling information, a request for a non-periodic CSI report, or anuplink transmission power command.

The DCI format monitored by the terminal device 2 is decided inaccordance with the transmission mode set for each serving cell. Inother words, a part of the DCI format monitored by the terminal device 2can differ depending on the transmission mode. For example, the terminaldevice 2 in which a downlink transmission mode 1 is set monitors the DCIformat 1A and the DCI format 1. For example, the terminal device 2 inwhich a downlink transmission mode 4 is set monitors the DCI format 1Aand the DCI format 2. For example, the terminal device 2 in which anuplink transmission mode 1 is set monitors the DCI format 0. Forexample, the terminal device 2 in which an uplink transmission mode 2 isset monitors the DCI format 0 and the DCI format 4.

A control region in which the PDCCH for notifying the terminal device 2of the DCI is placed is not notified of, and the terminal device 2detects the DCI for the terminal device 2 through blind decoding (blinddetection). Specifically, the terminal device 2 monitors a set of PDCCHcandidates in the serving cell. The monitoring indicates that decodingis attempted in accordance with all the DCI formats to be monitored foreach of the PDCCHs in the set. For example, the terminal device 2attempts to decode all aggregation levels, PDCCH candidates, and DCIformats which are likely to be transmitted to the terminal device 2. Theterminal device 2 recognizes the DCI (PDCCH) which is successfullydecoded (detected) as the DCI (PDCCH) for the terminal device 2.

A cyclic redundancy check (CRC) is added to the DCI. The CRC is used forthe DCI error detection and the DCI blind detection. A CRC parity bit(CRC) is scrambled using the RNTI. The terminal device 2 detects whetheror not it is a DCI for the terminal device 2 on the basis of the RNTI.Specifically, the terminal device 2 performs de-scrambling on the bitcorresponding to the CRC using a predetermined RNTI, extracts the CRC,and detects whether or not the corresponding DCI is correct.

The RNTI is specified or set in accordance with a purpose or a use ofthe DCI. The RNTI includes a cell-RNTI (C-RNTI), a semi persistentscheduling C-RNTI (SPS C-RNTI), a system information-RNTI (SI-RNTI), apaging-RNTI (P-RNTI), a random access-RNTI (RA-RNTI), a transmit powercontrol-PUCCH-RNTI (TPC-PUCCH-RNTI), a transmit power control-PUSCH-RNTI(TPC-PUSCH-RNTI), a temporary C-RNTI, a multimedia broadcast multicastservices (MBMS)-RNTI (M-RNTI)), and an eIMTA-RNTI.

The C-RNTI and the SPS C-RNTI are RNTIs which are specific to theterminal device 2 in the base station device 1 (cell), and serve asidentifiers identifying the terminal device 2. The C-RNTI is used forscheduling the PDSCH or the PUSCH in a certain sub frame. The SPS C-RNTIis used to activate or release periodic scheduling of resources for thePDSCH or the PUSCH. A control channel having a CRC scrambled using theSI-RNTI is used for scheduling a system information block (SIB). Acontrol channel with a CRC scrambled using the P-RNTI is used forcontrolling paging. A control channel with a CRC scrambled using theRA-RNTI is used for scheduling a response to the RACH. A control channelhaving a CRC scrambled using the TPC-PUCCH-RNTI is used for powercontrol of the PUCCH. A control channel having a CRC scrambled using theTPC-PUSCH-RNTI is used for power control of the PUSCH. A control channelwith a CRC scrambled using the temporary C-RNTI is used by a mobilestation device in which no C-RNTI is set or recognized. A controlchannel with CRC scrambled using the M-RNTI is used for scheduling theMBMS. A control channel with a CRC scrambled using the eIMTA-RNTI isused for notifying of information related to a TDD UL/DL setting of aTDD serving cell in dynamic TDD (eIMTA). Further, the DCI format may bescrambled using a new RNTI instead of the above RNTI.

Scheduling information (the downlink scheduling information, the uplinkscheduling information, and the sidelink scheduling information)includes information for scheduling in units of resource blocks orresource block groups as the scheduling of the frequency region. Theresource block group is successive resource block sets and indicatesresources allocated to the scheduled terminal device. A size of theresource block group is decided in accordance with a system bandwidth.

<Details of Downlink Control Channel in Present Embodiment>

The DCI is transmitted using a control channel such as the PDCCH or theEPDCCH. The terminal device 2 monitors a set of PDCCH candidates and/ora set of EPDCCH candidates of one or more activated serving cells set byRRC signaling. Here, the monitoring means that the PDCCH and/or theEPDCCH in the set corresponding to all the DCI formats to be monitoredis attempted to be decoded.

A set of PDCCH candidates or a set of EPDCCH candidates is also referredto as a search space. In the search space, a shared search space (CSS)and a terminal specific search space (USS) are defined. The CSS may bedefined only for the search space for the PDCCH.

A common search space (CSS) is a search space set on the basis of aparameter specific to the base station device 1 and/or a parameter whichis specified in advance. For example, the CSS is a search space used incommon to a plurality of terminal devices. Therefore, the base stationdevice 1 maps a control channel common to a plurality of terminaldevices to the CSS, and thus resources for transmitting the controlchannel are reduced.

A UE-specific search space (USS) is a search space set using at least aparameter specific to the terminal device 2. Therefore, the USS is asearch space specific to the terminal device 2, and it is possible toindividually transmit the control channel specific to the terminaldevice 2. For this reason, the base station device 1 can efficiently mapthe control channels specific to a plurality of terminal devices.

The USS may be set to be used in common to a plurality of terminaldevices. Since a common USS is set in a plurality of terminal devices, aparameter specific to the terminal device 2 is set to be the same valueamong a plurality of terminal devices. For example, a unit set to thesame parameter among a plurality of terminal devices is a cell, atransmission point, a group of predetermined terminal devices, or thelike.

The search space of each aggregation level is defined by a set of PDCCHcandidates. Each PDCCH is transmitted using one or more CCE sets. Thenumber of CCEs used in one PDCCH is also referred to as an aggregationlevel. For example, the number of CCEs used in one PDCCH is 1, 2, 4, or8.

The search space of each aggregation level is defined by a set of EPDCCHcandidates. Each EPDCCH is transmitted using one or more enhancedcontrol channel element (ECCE) sets. The number of ECCEs used in oneEPDCCH is also referred to as an aggregation level. For example, thenumber of ECCEs used in one EPDCCH is 1, 2, 4, 8, 16, or 32.

The number of PDCCH candidates or the number of EPDCCH candidates isdecided on the basis of at least the search space and the aggregationlevel. For example, in the CSS, the number of PDCCH candidates in theaggregation levels 4 and 8 are 4 and 2, respectively. For example, inthe USS, the number of PDCCH candidates in the aggregations 1, 2, 4, and8 are 6, 6, 2, and 2, respectively.

Each ECCE includes a plurality of EREGs. The EREG is used to definemapping to the resource element of the EPDCCH. 16 EREGs which areassigned numbers of 0 to 15 are defined in each RB pair. In other words,an EREG 0 to an EREG 15 are defined in each RB pair. For each RB pair,the EREG 0 to the EREG 15 are preferentially defined at regularintervals in the frequency direction for resource elements other thanresource elements to which a predetermined signal and/or channel ismapped. For example, the EREG is not defined for a resource element towhich a demodulation reference signal associated with an EPDCCHtransmitted through antenna ports 107 to 110 is mapped.

The number of ECCEs used in one EPDCCH depends on an EPDCCH format andis decided on the basis of other parameters. The number of ECCEs used inone EPDCCH is also referred to as an aggregation level. For example, thenumber of ECCEs used in one EPDCCH is decided on the basis of the numberof resource elements which can be used for transmission of the EPDCCH inone RB pair, a transmission method of the EPDCCH, and the like. Forexample, the number of ECCEs used in one EPDCCH is 1, 2, 4, 8, 16, or32. Further, the number of EREGs used in one ECCE is decided on thebasis of a type of sub frame and a type of cyclic prefix and is 4 or 8.Distributed transmission and localized transmission are supported as thetransmission method of the EPDCCH.

The distributed transmission or the localized transmission can be usedfor the EPDCCH. The distributed transmission and the localizedtransmission differ in mapping of the ECCE to the EREG and the RB pair.For example, in the distributed transmission, one ECCE is configuredusing EREGs of a plurality of RB pairs. In the localized transmission,one ECCE is configured using an EREG of one RB pair.

The base station device 1 performs a setting related to the EPDCCH inthe terminal device 2. The terminal device 2 monitors a plurality ofEPDCCHs on the basis of the setting from the base station device 1. Aset of RB pairs that the terminal device 2 monitors the EPDCCH can beset. The set of RB pairs is also referred to as an EPDCCH set or anEPDCCH-PRB set. One or more EPDCCH sets can be set in one terminaldevice 2. Each EPDCCH set includes one or more RB pairs. Further, thesetting related to the EPDCCH can be individually performed for eachEPDCCH set.

The base station device 1 can set a predetermined number of EPDCCH setsin the terminal device 2. For example, up to two EPDCCH sets can be setas an EPDCCH set 0 and/or an EPDCCH set 1. Each of the EPDCCH sets canbe constituted by a predetermined number of RB pairs. Each EPDCCH setconstitutes one set of ECCEs. The number of ECCEs configured in oneEPDCCH set is decided on the basis of the number of RB pairs set as theEPDCCH set and the number of EREGs used in one ECCE. In a case in whichthe number of ECCEs configured in one EPDCCH set is N, each EPDCCH setconstitutes ECCEs 0 to N−1. For example, in a case in which the numberof EREGs used in one ECCE is 4, the EPDCCH set constituted by 4 RB pairsconstitutes 16 ECCEs.

<Details of Channel State Information in Present Embodiment>

The terminal device 2 reports the CSI to the base station device 1. Thetime and frequency resources used to report the CSI are controlled bythe base station device 1. In the terminal device 2, a setting relatedto the CSI is performed through the RRC signaling from the base stationdevice 1. In the terminal device 2, one or more CSI processes are set ina predetermined transmission mode. The CSI reported by the terminaldevice 2 corresponds to the CSI process. For example, the CSI process isa unit of control or setting related to the CSI. For each of the CSIprocesses, a setting related to the CSI-RS resources, the CSI-IMresources, the periodic CSI report (for example, a period and an offsetof a report), and/or the non-periodic CSI report can be independentlyset.

The CSI includes a channel quality indicator (CQI), a precoding matrixindicator (PMI), a precoding type indicator (PTI), a rank indicator(RI), and/or a CSI-RS resource indicator (CRI). The RI indicates thenumber of transmission layers (the number of ranks). The PMI isinformation indicating a precoding matrix which is specified in advance.The PMI indicates one precoding matrix by one piece of information ortwo pieces of information. In a case in which two pieces of informationare used, the PMI is also referred to as a first PMI and a second PMI.The CQI is information indicating a combination of a modulation schemeand a coding rate which are specified in advance. The CRI is information(single instance) indicating one CSI-RS resource selected from two ormore CSI-RS resources in a case in which the two or more CSI-RSresources are set in one CSI process. The terminal device 2 reports theCSI to recommend to the base station device 1. The terminal device 2reports the CQI satisfying a predetermined reception quality for eachtransport block (codeword).

In the CRI report, one CSI-RS resource is selected from the CSI-RSresources to be set. In a case in which the CRI is reported, the PMI,the CQI, and the RI to be reported are calculated (selected) on thebasis of the reported CRI. For example, in a case in which the CSI-RSresources to be set are precoded, the terminal device 2 reports the CRI,so that precoding (beam) suitable for the terminal device 2 is reported.

A sub frame (reporting instances) in which periodic CSI reporting can beperformed are decided by a report period and a sub frame offset set by aparameter of a higher layer (a CQIPMI index, an RI index, and a CRIindex). Further, the parameter of the higher layer can be independentlyset in a sub frame set to measure the CSI. In a case in which only onepiece of information is set in a plurality of sub frame sets, thatinformation can be set in common to the sub frame sets. In each servingcell, one or more periodic CSI reports are set by the signaling of thehigher layer.

A CSI report type supports a PUCCH CSI report mode. The CSI report typeis also referred to as a PUCCH report type. A type 1 report supportsfeedback of the CQI for a terminal selection sub band. A type 1a reportsupports feedbank of a sub band CQI and a second PMI. Type 2, type 2b,type 2c reports support feedback of a wideband CQI and a PMI. A type 2areport supports feedbank of a wideband PMI. A type 3 report supportsfeedback of the RI. A type 4 report supports feedback of the widebandCQI. A type 5 report supports feedback of the RI and the wideband PMI. Atype 6 report supports feedback of the RI and the PTI. A type 7 reportsupports feedback of the CRI and the RI. A type 8 report supportsfeedback of the CRI, the RI, and the wideband PMI. A type 9 reportsupports feedback of the CRI, the RI, and the PTI. A type 10 reportsupports feedback of the CRI.

In the terminal device 2, information related to the CSI measurement andthe CSI report is set from the base station device 1. The CSImeasurement is performed on the basis of the reference signal and/or thereference resources (for example, the CRS, the CSI-RS, the CSI-IMresources, and/or the DRS). The reference signal used for the CSImeasurement is decided on the basis of the setting of the transmissionmode or the like. The CSI measurement is performed on the basis ofchannel measurement and interference measurement. For example, power ofa desired cell is measured through the channel measurement. Power andnoise power of a cell other than a desired cell are measured through theinterference measurement.

For example, in the CSI measurement, the terminal device 2 performs thechannel measurement and the interference measurement on the basis of theCRS. For example, in the CSI measurement, the terminal device 2 performsthe channel measurement on the basis of the CSI-RS and performs theinterference measurement on the basis of the CRS. For example, in theCSI measurement, the terminal device 2 performs the channel measurementon the basis of the CSI-RS and performs the interference measurement onthe basis of the CSI-IM resources.

The CSI process is set as information specific to the terminal device 2through signaling of the higher layer. In the terminal device 2, one ormore CSI processes are set, and the CSI measurement and the CSI reportare performed on the basis of the setting of the CSI process. Forexample, in a case in which a plurality of CSI processes are set, theterminal device 2 independently reports a plurality of CSIs based on theCSI processes. Each CSI process includes a setting for the cell stateinformation, an identifier of the CSI process, setting informationrelated to the CSI-RS, setting information related to the CSI-IM, a subframe pattern set for the CSI report, setting information related to theperiodic CSI report, setting information related to the non-periodic CSIreport. Further, the setting for the cell state information may becommon to a plurality of CSI processes.

The terminal device 2 uses the CSI reference resources to perform theCSI measurement. For example, the terminal device 2 measures the CSI ina case in which the PDSCH is transmitted using a group of downlinkphysical resource blocks indicated by the CSI reference resources. In acase in which the CSI sub frame set is set through the signaling of thehigher layer, each CSI reference resource belongs to one of the CSI subframe sets and does not belong to both of the CSI sub frame sets.

In the frequency direction, the CSI reference resource is defined by thegroup of downlink physical resource blocks corresponding to the bandsassociated with the value of the measured CQI.

In the layer direction (spatial direction), the CSI reference resourcesare defined by the RI and the PMI whose conditions are set by themeasured CQI. In other words, in the layer direction (spatialdirection), the CSI reference resources are defined by the RI and thePMI which are assumed or generated when the CQI is measured.

In the time direction, the CSI reference resources are defined by one ormore predetermined downlink sub frames. Specifically, the CSI referenceresources are defined by a valid sub frame which is a predeterminednumber before a sub frame for reporting the CSI. The predeterminednumber of sub frames for defining the CSI reference resources is decidedon the basis of the transmission mode, the frame configuration type, thenumber of CSI processes to be set, and/or the CSI report mode. Forexample, in a case in which one CSI process and the periodic CSI reportmode are set in the terminal device 2, the predetermined number of subframes for defining the CSI reference resource is a minimum value of 4or more among valid downlink sub frames.

A valid sub frame is a sub frame satisfying a predetermined condition. Adownlink sub frame in a serving cell is considered to be valid in a casein which some or all of the following conditions are satisfied.

(1) A valid downlink sub frame is a sub frame in an ON state in theterminal device 2 in which the RRC parameters related to the ON stateand the OFF state are set;

(2) A valid downlink sub frame is set as the downlink sub frame in theterminal device 2;

(3) A valid downlink sub frame is not a multimedia broadcast multicastservice single frequency network (MBSFN) sub frame in a predeterminedtransmission mode;

(4) A valid downlink sub frame is not included in a range of ameasurement interval (measurement gap) set in the terminal device 2;

(5) A valid downlink sub frame is an element or part of a CSI sub frameset linked to a periodic CSI report when the CSI sub frame set is set inthe terminal device 2 in the periodic CSI report; and

(6) A valid downlink sub frame is an element or part of a CSI sub frameset linked to a downlink sub frame associated with a corresponding CSIrequest in an uplink DCI format in a non-periodic CSI report for the CSIprocess. Under these conditions, a predetermined transmission mode, aplurality of CSI processes, and a CSI sub frame set for the CSI processare set in the terminal device 2.

<Details of Multicarrier Transmission in Present Embodiment>

A plurality of cells are set for the terminal device 2, and the terminaldevice 2 can perform multicarrier transmission. Communication in whichthe terminal device 2 uses a plurality of cells is referred to ascarrier aggregation (CA) or dual connectivity (DC). Contents describedin the present embodiment can be applied to each or some of a pluralityof cells set in the terminal device 2. The cell set in the terminaldevice 2 is also referred to as a serving cell.

In the CA, a plurality of serving cells to be set includes one primarycell (PCell) and one or more secondary cells (SCell).

One primary cell and one or more secondary cells can be set in theterminal device 2 that supports the CA.

The primary cell is a serving cell in which the initial connectionestablishment procedure is performed, a serving cell that the initialconnection re-establishment procedure is started, or a cell indicated asthe primary cell in a handover procedure. The primary cell operates witha primary frequency. The secondary cell can be set after a connection isconstructed or reconstructed. The secondary cell operates with asecondary frequency. Further, the connection is also referred to as anRRC connection.

The DC is an operation in which a predetermined terminal device 2consumes radio resources provided from at least two different networkpoints. The network point is a master base station device (a master eNB(MeNB)) and a secondary base station device (a secondary eNB (SeNB)). Inthe dual connectivity, the terminal device 2 establishes an RRCconnection through at least two network points. In the dualconnectivity, the two network points may be connected through anon-ideal backhaul.

In the DC, the base station device 1 which is connected to at least anS1-MME and plays a role of a mobility anchor of a core network isreferred to as a master base station device. Further, the base stationdevice 1 which is not the master base station device providingadditional radio resources to the terminal device 2 is referred to as asecondary base station device. A group of serving cells associated withthe master base station device is also referred to as a master cellgroup (MCG). A group of serving cells associated with the secondary basestation device is also referred to as a secondary cell group (SCG).

In the DC, the primary cell belongs to the MCG Further, in the SCG thesecondary cell corresponding to the primary cell is referred to as aprimary secondary cell (PSCell). A function (capability and performance)equivalent to the PCell (the base station device constituting the PCell)may be supported by the PSCell (the base station device constituting thePSCell). Further, the PSCell may only support some functions of thePCell. For example, the PSCell may support a function of performing thePDCCH transmission using the search space different from the CSS or theUSS. Further, the PSCell may constantly be in an activation state.Further, the PSCell is a cell that can receive the PUCCH.

In the DC, a radio bearer (a date radio bearer (DRB)) and/or a signalingradio bearer (SRB) may be individually allocated through the MeNB andthe SeNB. A duplex mode may be set individually in each of the MCG(PCell) and the SCG (PSCell). The MCG (PCell) and the SCG (PSCell) maynot be synchronized with each other. A parameter (a timing advance group(TAG)) for adjusting a plurality of timings may be independently set inthe MCG (PCell) and the SCG (PSCell). In the dual connectivity, theterminal device 2 transmits the UCI corresponding to the cell in the MCGonly through MeNB (PCell) and transmits the UCI corresponding to thecell in the SCG only through SeNB (pSCell). In the transmission of eachUCI, the transmission method using the PUCCH and/or the PUSCH is appliedin each cell group.

The PUCCH and the PBCH (MIB) are transmitted only through the PCell orthe PSCell. Further, the PRACH is transmitted only through the PCell orthe PSCell as long as a plurality of TAGs are not set between cells inthe CG.

In the PCell or the PSCell, semi-persistent scheduling (SPS) ordiscontinuous transmission (DRX) may be performed.

In the secondary cell, the same DRX as the PCell or the PSCell in thesame cell group may be performed.

In the secondary cell, information/parameter related to a setting of MACis basically shared with the PCell or the PSCell in the same cell group.Some parameters may be set for each secondary cell. Some timers orcounters may be applied only to the PCell or the PSCell.

In the CA, a cell to which the TDD scheme is applied and a cell to whichthe FDD scheme is applied may be aggregated. In a case in which the cellto which the TDD is applied and the cell to which the FDD is applied areaggregated, the present disclosure can be applied to either the cell towhich the TDD is applied or the cell to which the FDD is applied.

The terminal device 2 transmits information indicating a combination ofbands in which the CA is supported by the terminal device 2 to the basestation device 1. The terminal device 2 transmits information indicatingwhether or not simultaneous transmission and reception are supported ina plurality of serving cells in a plurality of different bands for eachof band combinations to the base station device 1.

<Details of Resource Allocation in Present Embodiment>

The base station device 1 can use a plurality of methods as a method ofallocating resources of the PDSCH and/or the PUSCH to the terminaldevice 2. The resource allocation method includes dynamic scheduling,semi persistent scheduling, multi sub frame scheduling, and cross subframe scheduling.

In the dynamic scheduling, one DCI performs resource allocation in onesub frame. Specifically, the PDCCH or the EPDCCH in a certain sub frameperforms scheduling for the PDSCH in the sub frame. The PDCCH or theEPDCCH in a certain sub frame performs scheduling for the PUSCH in apredetermined sub frame after the certain sub frame.

In the multi sub frame scheduling, one DCI allocates resources in one ormore sub frames. Specifically, the PDCCH or the EPDCCH in a certain subframe performs scheduling for the PDSCH in one or more sub frames whichare a predetermined number after the certain sub frame. The PDCCH or theEPDCCH in a certain sub frame performs scheduling for the PUSCH in oneor more sub frames which are a predetermined number after the sub frame.The predetermined number can be set to an integer of zero or more. Thepredetermined number may be specified in advance and may be decided onthe basis of the signaling of the physical layer and/or the RRCsignaling. In the multi sub frame scheduling, consecutive sub frames maybe scheduled, or sub frames with a predetermined period may bescheduled. The number of sub frames to be scheduled may be specified inadvance or may be decided on the basis of the signaling of the physicallayer and/or the RRC signaling.

In the cross sub frame scheduling, one DCI allocates resources in onesub frame. Specifically, the PDCCH or the EPDCCH in a certain sub frameperforms scheduling for the PDSCH in one sub frame which is apredetermined number after the certain sub frame. The PDCCH or theEPDCCH in a certain sub frame performs scheduling for the PUSCH in onesub frame which is a predetermined number after the sub frame. Thepredetermined number can be set to an integer of zero or more. Thepredetermined number may be specified in advance and may be decided onthe basis of the signaling of the physical layer and/or the RRCsignaling. In the cross sub frame scheduling, consecutive sub frames maybe scheduled, or sub frames with a predetermined period may bescheduled.

In the semi-persistent scheduling (SPS), one DCI allocates resources inone or more sub frames. In a case in which information related to theSPS is set through the RRC signaling, and the PDCCH or the EPDCCH foractivating the SPS is detected, the terminal device 2 activates aprocess related to the SPS and receives a predetermined PDSCH and/orPUSCH on the basis of a setting related to the SPS. In a case in whichthe PDCCH or the EPDCCH for releasing the SPS is detected when the SPSis activated, the terminal device 2 releases (inactivates) the SPS andstops reception of a predetermined PDSCH and/or PUSCH. The release ofthe SPS may be performed on the basis of a case in which a predeterminedcondition is satisfied. For example, in a case in which a predeterminednumber of empty transmission data is received, the SPS is released. Thedata empty transmission for releasing the SPS corresponds to a MACprotocol data unit (PDU) including a zero MAC service data unit (SDU).

Information related to the SPS by the RRC signaling includes an SPSC-RNTI which is an SPN RNTI, information related to a period (interval)in which the PDSCH is scheduled, information related to a period(interval) in which the PUSCH is scheduled, information related to asetting for releasing the SPS, and/or a number of the HARQ process inthe SPS. The SPS is supported only in the primary cell and/or theprimary secondary cell.

<HARQ in Present Embodiment>

In the present embodiment, the HARQ has various features. The HARQtransmits and retransmits the transport block. In the HARQ, apredetermined number of processes (HARQ processes) are used (set), andeach process independently operates in accordance with a stop-and-waitscheme.

In the downlink, the HARQ is asynchronous and operates adaptively. Inother words, in the downlink, retransmission is constantly scheduledthrough the PDCCH. The uplink HARQ-ACK (response information)corresponding to the downlink transmission is transmitted through thePUCCH or the PUSCH. In the downlink, the PDCCH notifies of a HARQprocess number indicating the HARQ process and information indicatingwhether or not transmission is initial transmission or retransmission.

In the uplink, the HARQ operates in a synchronous or asynchronousmanner. The downlink HARQ-ACK (response information) corresponding tothe uplink transmission is transmitted through the PHICH. In the uplinkHARQ, an operation of the terminal device is decided on the basis of theHARQ feedback received by the terminal device and/or the PDCCH receivedby the terminal device. For example, in a case in which the PDCCH is notreceived, and the HARQ feedback is ACK, the terminal device does notperform transmission (retransmission) but holds data in a HARQ buffer.In this case, the PDCCH may be transmitted in order to resume theretransmission. Further, for example, in a case in which the PDCCH isnot received, and the HARQ feedback is NACK, the terminal deviceperforms retransmission non-adaptively through a predetermined uplinksub frame. Further, for example, in a case in which the PDCCH isreceived, the terminal device performs transmission or retransmission onthe basis of contents notified through the PDCCH regardless of contentof the HARQ feedback.

Further, in the uplink, in a case in which a predetermined condition(setting) is satisfied, the HARQ may be operated only in an asynchronousmanner. In other words, the downlink HARQ-ACK is not transmitted, andthe uplink retransmission may constantly be scheduled through the PDCCH.

In the HARQ-ACK report, the HARQ-ACK indicates ACK, NACK, or DTX. In acase in which the HARQ-ACK is ACK, it indicates that the transport block(codeword and channel) corresponding to the HARQ-ACK is correctlyreceived (decoded). In a case in which the HARQ-ACK is NACK, itindicates that the transport block (codeword and channel) correspondingto the HARQ-ACK is not correctly received (decoded). In a case in whichthe HARQ-ACK is DTX, it indicates that the transport block (codeword andchannel) corresponding to the HARQ-ACK is not present (not transmitted).

A predetermined number of HARQ processes are set (specified) in each ofdownlink and uplink. For example, in FDD, up to eight HARQ processes areused for each serving cell. Further, for example, in TDD, a maximumnumber of HARQ processes is decided by an uplink/downlink setting. Amaximum number of HARQ processes may be decided on the basis of a roundtrip time (RTT). For example, in a case in which the RTT is 8 TTIs, themaximum number of the HARQ processes can be 8.

In the present embodiment, the HARQ information is constituted by atleast a new data indicator (NDI) and a transport block size (TBS). TheNDI is information indicating whether or not the transport blockcorresponding to the HARQ information is initial transmission orretransmission. The TBS is the size of the transport block. Thetransport block is a block of data in a transport channel (transportlayer) and can be a unit for performing the HARQ. In the DL-SCHtransmission, the HARQ information further includes a HARQ process ID (aHARQ process number). In the UL-SCH transmission, the HARQ informationfurther includes an information bit in which the transport block isencoded and a redundancy version (RV) which is information specifying aparity bit. In the case of spatial multiplexing in the DL-SCH, the HARQinformation thereof includes a set of NDI and TBS for each transportblock.

<Details of LTE Downlink Resource Element Mapping in Present Embodiment>

FIG. 10 is a diagram illustrating an example of LTE downlink resourceelement mapping in the present embodiment. In this example, a set ofresource elements in one resource block pair in a case in which oneresource block and the number of OFDM symbols in one slot are 7 will bedescribed. Further, seven OFDM symbols in a first half in the timedirection in the resource block pair are also referred to as a slot 0 (afirst slot). Seven OFDM symbols in a second half in the time directionin the resource block pair are also referred to as a slot 1 (a secondslot). Further, the OFDM symbols in each slot (resource block) areindicated by OFDM symbol number 0 to 6. Further, the sub carriers in thefrequency direction in the resource block pair are indicated by subcarrier numbers 0 to 11. Further, in a case in which a system bandwidthis constituted by a plurality of resource blocks, a different subcarrier number is allocated over the system bandwidth. For example, in acase in which the system bandwidth is constituted by six resourceblocks, the sub carriers to which the sub carrier numbers 0 to 71 areallocated are used. Further, in the description of the presentembodiment, a resource element (k, l) is a resource element indicated bya sub carrier number k and an OFDM symbol number l.

Resource elements indicated by R 0 to R 3 indicate cell-specificreference signals of the antenna ports 0 to 3, respectively.Hereinafter, the cell-specific reference signals of the antenna ports 0to 3 are also referred to as cell-specific RSs (CRSs). In this example,the case of the antenna ports in which the number of CRSs is 4 isdescribed, but the number thereof can be changed. For example, the CRScan use one antenna port or two antenna ports. Further, the CRS canshift in the frequency direction on the basis of the cell ID. Forexample, the CRS can shift in the frequency direction on the basis of aremainder obtained by dividing the cell ID by 6.

Resource element indicated by C1 to C4 indicates reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. The resource elements denoted by C1 to C4 indicate CSI-RSs of aCDM group 1 to a CDM group 4, respectively. The CSI-RS is constituted byan orthogonal sequence (orthogonal code) using a Walsh code and ascramble code using a pseudo random sequence. Further, the CSI-RS iscode division multiplexed using an orthogonal code such as a Walsh codein the CDM group. Further, the CSI-RS is frequency-division multiplexed(FDM) mutually between the CDM groups.

The CSI-RSs of the antenna ports 15 and 16 are mapped to C1. The CSI-RSsof the antenna ports 17 and 18 is mapped to C2. The CSI-RSs of theantenna port 19 and 20 are mapped to C3. The CSI-RSs of the antenna port21 and 22 are mapped to C4.

A plurality of antenna ports of the CSI-RSs are specified.

The CSI-RS can be set as a reference signal corresponding to eightantenna ports of the antenna ports 15 to 22. Further, the CSI-RS can beset as a reference signal corresponding to four antenna ports of theantenna ports 15 to 18. Further, the CSI-RS can be set as a referencesignal corresponding to two antenna ports of the antenna ports 15 to 16.Further, the CSI-RS can be set as a reference signal corresponding toone antenna port of the antenna port 15. The CSI-RS can be mapped tosome sub frames, and, for example, the CSI-RS can be mapped for everytwo or more sub frames. A plurality of mapping patterns are specifiedfor the resource element of the CSI-RS. Further, the base station device1 can set a plurality of CSI-RSs in the terminal device 2.

The CSI-RS can set transmission power to zero. The CSI-RS with zerotransmission power is also referred to as a zero power CSI-RS. The zeropower CSI-RS is set independently of the CSI-RS of the antenna ports 15to 22. Further, the CSI-RS of the antenna ports 15 to 22 is alsoreferred to as a non-zero power CSI-RS.

The base station device 1 sets CSI-RS as control information specific tothe terminal device 2 through the RRC signaling. In the terminal device2, the CSI-RS is set through the RRC signaling by the base stationdevice 1. Further, in the terminal device 2, the CSI-IM resources whichare resources for measuring interference power can be set. The terminaldevice 2 generates feedback information using the CRS, the CSI-RS,and/or the CSI-IM resources on the basis of a setting from the basestation device 1.

Resource elements indicated by D1 to D2 indicate the DL-DMRSs of the CDMgroup 1 and the CDM group 2, respectively. The DL-DMRS is constitutedusing an orthogonal sequence (orthogonal code) using a Walsh code and ascramble sequence according to a pseudo random sequence. Further, theDL-DMRS is independent for each antenna port and can be multiplexedwithin each resource block pair. The DL-DMRSs are in an orthogonalrelation with each other between the antenna ports in accordance withthe CDM and/or the FDM. Each of DL-DMRSs undergoes the CDM in the CDMgroup in accordance with the orthogonal codes. The DL-DMRSs undergo theFDM with each other between the CDM groups. The DL-DMRSs in the same CDMgroup are mapped to the same resource element. For the DL-DMRSs in thesame CDM group, different orthogonal sequences are used between theantenna ports, and the orthogonal sequences are in the orthogonalrelation with each other. The DL-DMRS for the PDSCH can use some or allof the eight antenna ports (the antenna ports 7 to 14). In other words,the PDSCH associated with the DL-DMRS can perform MIMO transmission ofup to 8 ranks. The DL-DMRS for the EPDCCH can use some or all of thefour antenna ports (the antenna ports 107 to 110). Further, the DL-DMRScan change a spreading code length of the CDM or the number of resourceelements to be mapped in accordance with the number of ranks of anassociated channel.

The DL-DMRS for the PDSCH to be transmitted through the antenna ports 7,8, 11, and 13 are mapped to the resource element indicated by D1. TheDL-DMRS for the PDSCH to be transmitted through the antenna ports 9, 10,12, and 14 are mapped to the resource element indicated by D2. Further,the DL-DMRS for the EPDCCH to be transmitted through the antenna ports107 and 108 are mapped to the resource element indicated by D1. TheDL-DMRS for the EPDCCH to be transmitted through the antenna ports 109and 110 are mapped to the resource element denoted by D2.

<Details of Downlink Resource Elements Mapping of NR in PresentEmbodiment>

Hereinafter, an example of downlink resource element mapping ofpredetermined resources in NR will be described.

Here, the predetermined resource may be referred to as an NR resourceblock (NR-RB) which is a resource block in NR. The predeterminedresource can be defined on the basis of a unit of allocation related toa predetermined channel or a predetermined signal such as the NR-PDSCHor the NR-PDCCH, a unit in which mapping of the predetermined channel orthe predetermined signal to a resource element is defined, and/or a unitin which the parameter set is set.

FIG. 11 is a diagram illustrating an example of the downlink resourceelement mapping of NR according to the present embodiment. FIG. 11illustrates a set of resource elements in the predetermined resources ina case in which parameter set 0 is used. The predetermined resourcesillustrated in FIG. 11 are resources formed by a time length and afrequency bandwidth such as one resource block pair in LTE.

In the example of FIG. 11, the predetermined resources include 14 OFDMsymbols indicated by OFDM symbol numbers 0 to 13 in the time directionand 12 sub carriers indicated by sub carrier numbers 0 to 11 in thefrequency direction. In a case in which the system bandwidth includesthe plurality of predetermined resources, sub carrier numbers areallocated throughout the system bandwidth.

Resource elements indicated by C1 to C4 indicate reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. Resource elements indicated by D1 and D2 indicate DL-DMRS of CDMgroup 1 and CDM group 2, respectively.

FIG. 12 is a diagram illustrating an example of the downlink resourceelement mapping of NR according to the present embodiment. FIG. 12illustrates a set of resource elements in the predetermined resources ina case in which parameter set 1 is used. The predetermined resourcesillustrated in FIG. 12 are resources formed by the same time length andfrequency bandwidth as one resource block pair in LTE.

In the example of FIG. 12, the predetermined resources include 7 OFDMsymbols indicated by OFDM symbol numbers 0 to 6 in the time directionand 24 sub carriers indicated by sub carrier numbers 0 to 23 in thefrequency direction. In a case in which the system bandwidth includesthe plurality of predetermined resources, sub carrier numbers areallocated throughout the system bandwidth.

Resource elements indicated by C1 to C4 indicate reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. Resource elements indicated by D1 and D2 indicate DL-DMRS of CDMgroup 1 and CDM group 2, respectively.

FIG. 13 is a diagram illustrating an example of the downlink resourceelement mapping of NR according to the present embodiment. FIG. 13illustrates a set of resource elements in the predetermined resources ina case in which parameter set 1 is used. The predetermined resourcesillustrated in FIG. 13 are resources formed by the same time length andfrequency bandwidth as one resource block pair in LTE.

In the example of FIG. 13, the predetermined resources include 28 OFDMsymbols indicated by OFDM symbol numbers 0 to 27 in the time directionand 6 sub carriers indicated by sub carrier numbers 0 to 6 in thefrequency direction. In a case in which the system bandwidth includesthe plurality of predetermined resources, sub carrier numbers areallocated throughout the system bandwidth.

Resource elements indicated by C1 to C4 indicate reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. Resource elements indicated by D1 and D2 indicate DL-DMRS of CDMgroup 1 and CDM group 2, respectively.

For example, in NR, reference signals equivalent to the CRS in LTE maynot transmitted.

<Details of Resource Element Mapping Method of NR in Present Embodiment>

As described above, in the present embodiment, physical signals withdifferent parameters related to the transmission signal illustrated inFIGS. 11 to 13 can be multiplexed by the FDM or the like in NR. Forexample, the multiplexing is performed using predetermined resources asa unit. Further, even in a case in which the base station device 1performing scheduling or the like recognizes the multiplexing, theterminal device terminal 2 may not recognize the multiplexing. Theterminal device 2 may recognize only a physical signal received ortransmitted by the terminal device 2 or may not recognize a physicalsignal not received or transmitted by the terminal device 2.

Further, parameters related to the transmission signal can be defined,set, or specified in the mapping to the resource elements. In NR, theresource element mapping can be performed using various methods. Notethat, in the present embodiment, a method of the resource elementmapping of NR will be described with regard to a downlink, but the samecan apply to an uplink and a sidelink.

A first mapping method related to the resource element mapping in NR isa method of setting or specifying parameters (physical parameters)related to the transmission signal in the predetermined resources.

In the first mapping method, parameters related to the transmissionsignal are set in the predetermined resources. The parameters related tothe transmission signal set in the predetermined resources include a subframe interval of the sub carriers in the predetermined resources, thenumber of sub carriers included in the predetermined resources, thenumber of symbols included in the predetermined resources, a CP lengthtype in the predetermined resources, a multiple access scheme used inthe predetermined resources, and/or a parameter set in the predeterminedresources.

For example, in the first mapping method, a resource grid in NR can bedefined with the predetermined resources.

FIG. 14 is a diagram illustrating an example of a resource elementmapping method of NR according to the present embodiment. In the exampleof FIG. 14, one or more predetermined resources can undergo the FDM in apredetermined system bandwidth and a predetermined time region (subframe).

A bandwidth in the predetermined resources and/or a time length in thepredetermined resources can be specified in advance. For example, abandwidth in the predetermined resources corresponds to 180 kHz and atime length in the predetermined resources corresponds to 1 millisecond.That is, the predetermined resources correspond to the same bandwidthand time length as the resource block pair in LTE.

In addition, the bandwidth in the predetermined resources and/or thetime length in the predetermined resources can be set by RRC signaling.For example, the bandwidth in the predetermined resources and/or thetime length in the predetermined resources is set to be specific to thebase station device 1 (cell) on the basis of information included in theMIB or the SIB transmitted via a broadcast channel or the like. Further,for example, the bandwidth in the predetermined resources and/or thetime length in the predetermined resources is set to be specific to theterminal device 2 on the basis of control information specific to theterminal device 2.

In the first mapping method, the parameters related to the transmissionsignal set in the predetermined resources can be set by RRC signaling.For example, the parameters are set to be specific to the base stationdevice 1 (cell) on the basis of information included in the MIB or theSIB transmitted via a broadcast channel or the like. Further, forexample, the parameters are set to be specific to the terminal device 2on the basis of control information specific to the terminal device 2.

In the first mapping method, the parameters related to the transmissionsignal set in the predetermined resources are set on the basis of atleast one of the following methods or definitions.

(1) The parameters related to the transmission signal are setindividually in each of the predetermined resources.

(2) The parameters related to the transmission signal are setindividually in each group of the predetermined resources. The group ofthe predetermined resources is a set of the predetermined resourcessuccessive in the frequency direction. The number of predeterminedresources included in the group may be specified in advance or may beset by RRC signaling.

(3) The predetermined resources in which certain parameters are set arepredetermined successive resources decided on the basis of informationindicating a starting predetermined resource and/or ending predeterminedresource. The information can be set by RRC signaling.

(4) The predetermined resource in which a certain parameter is set isindicated by information regarding a bit map. For example, each bitincluded in the information regarding a bit map corresponds to thepredetermined resource or a group of the predetermined resources. In acase in which the bit included in the information regarding the bit mapis 1, the parameter is set in the predetermined resource or the group ofthe predetermined resources corresponding to the bit. The informationregarding the bit map can be set by RRC signaling.

(5) In the predetermined resource to which a predetermined signal or apredetermined channel is mapped (transmitted), a parameter specified inadvance is used. For example, in the predetermined resource in which asynchronization signal or a broadcast channel is transmitted, aparameter specified in advance is used. For example, the parameterspecified in advance corresponds to the same bandwidth and time lengthas the resource block pair in LTE.

(6) In a predetermined time region including the predetermined resourcesin which the predetermined signals or the predetermined channels aremapped (transmitted) (that is, all the predetermined resources includedin the predetermined time region), parameters specified in advance areused. For example, in a sub frame including a predetermined resource inwhich a synchronization signal or a broadcast channel is transmitted, aparameter specified in advance is used. For example, the parameterspecified in advance corresponds to the same bandwidth and time lengthas the resource block pair in LTE.

(7) In a predetermined resource in which a parameter is not set, aparameter specified in advance is used. For example, in a predeterminedresource in which a parameter is not set, the same parameter as thepredetermined resource in which a synchronization signal or a broadcastchannel is transmitted is used.

(8) In one cell (component carrier), parameters which can be set arerestricted. For example, for a sub carrier interval which can be set inone cell, the bandwidth in the predetermined resources is a value whichis an integer multiple of the sub carrier interval. Specifically, in acase in which the bandwidth in the predetermined resources is 180 kHz,the sub carrier interval which can be set includes 3.75 kHz, 7.5 kHz, 15kHz, 30 kHz, and 60 kHz.

A second mapping method related to the resource element mapping in NR isa method based on sub resource elements used to define a resourceelement.

In the second mapping method, the sub resource elements are used tospecify, set, or define a resource element corresponding to a parameterrelated to the transmission signal. In the second mapping method, theresource element and the sub resource element are referred to as a firstelement and a second element, respectively.

In other words, in the second mapping method, the parameters (physicalparameters) related to the transmission signal are set on the basis ofthe setting related to the sub resource elements.

For example, in a predetermined resource, the number of sub resourceelements or a pattern of the sub resource elements included in oneresource element is set. Further, the predetermined resources can be setto be the same as the predetermined resources described in the presentembodiment.

For example, in the second mapping method, a resource grid in NR can bedefined with a predetermined number of sub resource elements.

FIG. 15 is a diagram illustrating an example of a resource elementmapping method of NR according to the present embodiment. In the exampleof FIG. 15, each predetermined resource includes 28 sub resourceelements in the time direction and 24 sub resource elements in thefrequency direction. That is, in a case in which the frequency bandwidthin the predetermined resources is 180 kHz, the frequency bandwidth inthe sub resource elements is 7.5 kHz.

A bandwidth in the sub resource elements and/or a time length in the subresource elements can be specified in advance. Further, for example, thesub resource elements correspond to the same bandwidth (15 kHz) and timelength as the sub resource elements in LTE.

In addition, the bandwidth in the sub resource elements and/or the timelength in the sub resource elements can be set by RRC signaling. Forexample, the bandwidth in the sub resource elements and/or the timelength in the sub resource elements are set to be specific to the basestation device 1 (cell) on the basis of information included in the MIBor the SIB transmitted via a broadcast channel or the like. Further, forexample, the bandwidth in the sub resource elements and/or the timelength in the sub resource elements is set to be specific to theterminal device 2 on the basis of control information specific to theterminal device 2. Further, in a case in which the bandwidth in the subresource elements and/or the time length in the sub resource elements isnot set, the sub resource elements can correspond to the same bandwidth(15 kHz) and time length as the sub resource elements in LTE.

In the second mapping method, the sub resource elements included in oneresource element can be set on the basis of at least one of thefollowing methods or definitions.

(1) The setting is performed individually for each predeterminedresource.

(2) The setting is performed individually for each group of thepredetermined resources. The group of the predetermined resources is aset of the predetermined resources successive in the frequencydirection. The number of predetermined resources included in the groupmay be specified in advance or may be set by RRC signaling.

(3) The predetermined resources on which the setting is performed arepredetermined successive resources decided on the basis of informationindicating a starting predetermined resource and/or ending predeterminedresource. The information can be set by RRC signaling.

(4) The predetermined resource on which the setting is performed isindicated by information regarding a bit map. For example, each bitincluded in the information regarding a bit map corresponds to thepredetermined resource or a group of the predetermined resources. In acase in which the bit included in the information regarding the bit mapis 1, the setting is performed on the predetermined resource or thegroup of the predetermined resources corresponding to the bit. Theinformation regarding the bit map can be set by RRC signaling.

(5) In the predetermined resource to which a predetermined signal or apredetermined channel is mapped (transmitted), the sub resource elementsincluded in one resource element are specified in advance. For example,in the predetermined resource in which a synchronization signal or abroadcast channel is transmitted, the sub resource elements included inone resource element are specified in advance. For example, the subresource elements specified in advance correspond to the same bandwidthand time length as the resource elements in LTE.

(6) In a predetermined time region including the predetermined resourcesin which the predetermined signals or the predetermined channels aremapped (transmitted) (that is, all the predetermined resources includedin the predetermined time region), the sub resource elements included inone resource element are specified in advance. For example, in apredetermined time region including the predetermined resources in whicha synchronization signal or a broadcast channel is transmitted, the subresource elements included in one resource element are specified inadvance. For example, the sub resource elements specified in advancecorrespond to the same bandwidth and time length as the resourceelements in LTE.

(7) In the predetermined resources in which the setting is notperformed, the sub resource elements included in one resource elementare specified in advance. For example, in the predetermined resources inwhich the setting is not performed, the sub resource elements includedin one resource element are the same sub resource elements used in thepredetermined resource in which a synchronization signal or a broadcastchannel is transmitted.

(8) The setting is the number of sub resource elements included in oneresource element. The number of sub resource elements included in oneresource element in the frequency direction and/or the time direction isset. For example, the sub resource elements are considered to be set asin FIG. 15. In a case in which 1 resource element includes 2 subresource elements in the frequency direction and 2 sub resource elementsin the time direction in the predetermined resource, the predeterminedresource includes 12 sub carriers and 14 symbols. This configuration(setting) is the same as the number of sub carriers and the number ofsymbols included in the resource block pair in LTE and is suitable for ause case of eMBB. Further, in a case in which 1 resource elementincludes 4 sub resource elements in the frequency direction and 1 subresource element in the time direction in the predetermined resource,the predetermined resource includes 6 sub carriers and 28 symbols. Thisconfiguration (setting) is suitable for a use case of URLLC. Further, ina case in which 1 resource element includes 1 sub resource element inthe frequency direction and 4 sub resource elements in the timedirection in the predetermined resource, the predetermined resourceincludes 24 sub carriers and 7 symbols. This configuration (setting) issuitable for a use case of mMTC.

(9) The number of sub resource elements included in one resource elementdescribed in the foregoing (8) is patterned in advance and information(an index) indicating the pattern is used for the setting. The patterncan include a CP length type, definition of the sub resource elements, amultiple access scheme, and/or a parameter set.

(10) In one cell (component carrier) or one time region (sub frame), thenumber of sub resource elements included in one resource element isconstant. For example, in one cell or one time region, all the number ofsub resource elements included in one resource element is 4 as in theexample described in the foregoing (8). That is, in the example, it ispossible to configure the resource element of the bandwidth and the timelength in which the number of sub resource elements included in oneresource element is 4.

Note that in the description of the present embodiment, thepredetermined resource has been used for the resource element mapping ina downlink, an uplink, or a sidelink in NR, as described above. However,the present disclosure is not limited thereto. The predeterminedresource may be used for resource element mapping in two or more linksamong a downlink, an uplink, and a sidelink.

For example, the predetermined resource is used for resource elementmapping in the downlink, the uplink, and the sidelink. In a certainpredetermined resource, a predetermined number of front symbols is usedfor resource element mapping in the downlink. In the predeterminedresource, a predetermined number of rear symbols is used for resourceelement mapping in the uplink. In the predetermined resource, apredetermined number of symbols between the predetermined number offront symbols and the predetermined number of rear symbols may be usedfor a guard period. In the predetermined resource, with regard to thepredetermined number of front symbols and the predetermined number ofrear symbols, the same physical parameters may be used or independentlyset physical parameters may be used.

Note that in the description of the present embodiment, the downlink,the uplink, and the sidelink have been described as the independentlydefined links in NR, but the present disclosure is not limited thereto.The downlink, the uplink, and the sidelink may be defined as a commonlink. For example, the channels, the signals, the processes, and/or theresources and the like described in the present embodiment are definedirrespective of the downlink, the uplink, and the sidelink. In the basestation device 1 or the terminal device 2, the channels, the signals,the processes, and/or the resource, and the like are decided on thebasis of the setting specified in advance, the setting by RRC signaling,and/or the control information in the physical layer. For example, inthe terminal device 2, channels and signals which can be transmitted andreceived are decided on the basis of setting form the base stationdevice 1.

Application Examples Application Examples for Base Station FirstApplication Example

FIG. 16 is a block diagram illustrating a first example of a schematicconfiguration of an eNB to which the technology according to the presentdisclosure may be applied. An eNB 800 includes one or more antennas 810and a base station apparatus 820. Each antenna 810 and the base stationapparatus 820 may be connected to each other via an RF cable.

Each of the antennas 810 includes a single or a plurality of antennaelements (e.g., a plurality of antenna elements constituting a MIMOantenna) and is used for the base station apparatus 820 to transmit andreceive a wireless signal. The eNB 800 may include the plurality of theantennas 810 as illustrated in FIG. 16, and the plurality of antennas810 may, for example, correspond to a plurality of frequency bands usedby the eNB 800. It should be noted that while FIG. 16 illustrates anexample in which the eNB 800 includes the plurality of antennas 810, theeNB 800 may include the single antenna 810.

The base station apparatus 820 includes a controller 821, a memory 822,a network interface 823, and a wireless communication interface 825.

The controller 821 may be, for example, a CPU or a DSP, and operatesvarious functions of an upper layer of the base station apparatus 820.For example, the controller 821 generates a data packet from data in asignal processed by the wireless communication interface 825, andtransfers the generated packet via the network interface 823. Thecontroller 821 may generate a bundled packet by bundling data from aplurality of base band processors to transfer the generated bundledpacket. Further, the controller 821 may also have a logical function ofperforming control such as radio resource control, radio bearer control,mobility management, admission control, and scheduling. Further, thecontrol may be performed in cooperation with a surrounding eNB or a corenetwork node. The memory 822 includes a RAM and a ROM, and stores aprogram executed by the controller 821 and a variety of control data(such as, for example, terminal list, transmission power data, andscheduling data).

The network interface 823 is a communication interface for connectingthe base station apparatus 820 to the core network 824. The controller821 may communicate with a core network node or another eNB via thenetwork interface 823. In this case, the eNB 800 may be connected to acore network node or another eNB through a logical interface (e.g., S1interface or X2 interface). The network interface 823 may be a wiredcommunication interface or a wireless communication interface forwireless backhaul. In the case where the network interface 823 is awireless communication interface, the network interface 823 may use ahigher frequency band for wireless communication than a frequency bandused by the wireless communication interface 825.

The wireless communication interface 825 supports a cellularcommunication system such as long term evolution (LTE) or LTE-Advanced,and provides wireless connection to a terminal located within the cellof the eNB 800 via the antenna 810. The wireless communication interface825 may typically include a base band (BB) processor 826, an RF circuit827, and the like. The BB processor 826 may, for example, performencoding/decoding, modulation/demodulation, multiplexing/demultiplexing,and the like, and performs a variety of signal processing on each layer(e.g., L1, medium access control (MAC), radio link control (RLC), andpacket data convergence protocol (PDCP)). The BB processor 826 may havepart or all of the logical functions as described above instead of thecontroller 821. The BB processor 826 may be a module including a memoryhaving a communication control program stored therein, a processor toexecute the program, and a related circuit, and the function of the BBprocessor 826 may be changeable by updating the program. Further, themodule may be a card or blade to be inserted into a slot of the basestation apparatus 820, or a chip mounted on the card or the blade.Meanwhile, the RF circuit 827 may include a mixer, a filter, anamplifier, and the like, and transmits and receives a wireless signalvia the antenna 810.

The wireless communication interface 825 may include a plurality of theBB processors 826 as illustrated in FIG. 16, and the plurality of BBprocessors 826 may, for example, correspond to a plurality of frequencybands used by the eNB 800. Further, the wireless communication interface825 may also include a plurality of the RF circuits 827, as illustratedin FIG. 16, and the plurality of RF circuits 827 may, for example,correspond to a plurality of antenna elements. Note that FIG. 16illustrates an example in which the wireless communication interface 825includes the plurality of BB processors 826 and the plurality of RFcircuits 827, but the wireless communication interface 825 may includethe single BB processor 826 or the single RF circuit 827.

Second Application Example

FIG. 17 is a block diagram illustrating a second example of a schematicconfiguration of an eNB to which the technology according to the presentdisclosure may be applied. An eNB 830 includes one or more antennas 840,a base station apparatus 850, and an RRH 860. Each of the antennas 840and the RRH 860 may be connected to each other via an RF cable. Further,the base station apparatus 850 and the RRH 860 may be connected to eachother by a high speed line such as optical fiber cables.

Each of the antennas 840 includes a single or a plurality of antennaelements (e.g., antenna elements constituting a MIMO antenna), and isused for the RRH 860 to transmit and receive a wireless signal. The eNB830 may include a plurality of the antennas 840 as illustrated in FIG.17, and the plurality of antennas 840 may, for example, correspond to aplurality of frequency bands used by the eNB 830. Note that FIG. 17illustrates an example in which the eNB 830 includes the plurality ofantennas 840, but the eNB 830 may include the single antenna 840.

The base station apparatus 850 includes a controller 851, a memory 852,a network interface 853, a wireless communication interface 855, and aconnection interface 857. The controller 851, the memory 852, and thenetwork interface 853 are similar to the controller 821, the memory 822,and the network interface 823 described with reference to FIG. 16.

The wireless communication interface 855 supports a cellularcommunication system such as LTE and LTE-Advanced, and provides wirelessconnection to a terminal located in a sector corresponding to the RRH860 via the RRH 860 and the antenna 840. The wireless communicationinterface 855 may typically include a BB processor 856 or the like. TheBB processor 856 is similar to the BB processor 826 described withreference to FIG. 15 except that the BB processor 856 is connected to anRF circuit 864 of the RRH 860 via the connection interface 857. Thewireless communication interface 855 may include a plurality of the BBprocessors 856, as illustrated in FIG. 16, and the plurality of BBprocessors 856 may, for example, correspond to a plurality of frequencybands used by the eNB 830. Note that FIG. 16 illustrates an example inwhich the wireless communication interface 855 includes the plurality ofBB processors 856, but the wireless communication interface 855 mayinclude the single BB processor 856.

The connection interface 857 is an interface for connecting the basestation apparatus 850 (wireless communication interface 855) to the RRH860. The connection interface 857 may be a communication module forcommunication on the high speed line which connects the base stationapparatus 850 (wireless communication interface 855) to the RRH 860.

Further, the RRH 860 includes a connection interface 861 and a wirelesscommunication interface 863.

The connection interface 861 is an interface for connecting the RRH 860(wireless communication interface 863) to the base station apparatus850. The connection interface 861 may be a communication module forcommunication on the high speed line.

The wireless communication interface 863 transmits and receives awireless signal via the antenna 840. The wireless communicationinterface 863 may typically include the RF circuit 864 or the like. TheRF circuit 864 may include a mixer, a filter, an amplifier and the like,and transmits and receives a wireless signal via the antenna 840. Thewireless communication interface 863 may include a plurality of the RFcircuits 864 as illustrated in FIG. 17, and the plurality of RF circuits864 may, for example, correspond to a plurality of antenna elements.Note that FIG. 17 illustrates an example in which the wirelesscommunication interface 863 includes the plurality of RF circuits 864,but the wireless communication interface 863 may include the single RFcircuit 864.

The eNB 800, the eNB 830, the base station device 820, or the basestation device 850 illustrated in FIGS. 16 and 17 may correspond to thebase station device 1 described above with reference to FIG. 3 and thelike.

Application Examples for Terminal Apparatus First Application Example

FIG. 18 is a block diagram illustrating an example of a schematicconfiguration of a smartphone 900 as the terminal apparatus 2 to whichthe technology according to the present disclosure may be applied. Thesmartphone 900 includes a processor 901, a memory 902, a storage 903, anexternal connection interface 904, a camera 906, a sensor 907, amicrophone 908, an input device 909, a display device 910, a speaker911, a wireless communication interface 912, one or more antennaswitches 915, one or more antennas 916, a bus 917, a battery 918, and anauxiliary controller 919.

The processor 901 may be, for example, a CPU or a system on chip (SoC),and controls the functions of an application layer and other layers ofthe smartphone 900. The memory 902 includes a RAM and a ROM, and storesa program executed by the processor 901 and data. The storage 903 mayinclude a storage medium such as semiconductor memories and hard disks.The external connection interface 904 is an interface for connecting thesmartphone 900 to an externally attached device such as memory cards anduniversal serial bus (USB) devices.

The camera 906 includes, for example, an image sensor such as chargecoupled devices (CCDs) and complementary metal oxide semiconductor(CMOS), and generates a captured image. The sensor 907 may include asensor group including, for example, a positioning sensor, a gyrosensor, a geomagnetic sensor, an acceleration sensor and the like. Themicrophone 908 converts a sound that is input into the smartphone 900 toan audio signal. The input device 909 includes, for example, a touchsensor which detects that a screen of the display device 910 is touched,a key pad, a keyboard, a button, a switch or the like, and accepts anoperation or an information input from a user. The display device 910includes a screen such as liquid crystal displays (LCDs) and organiclight emitting diode (OLED) displays, and displays an output image ofthe smartphone 900. The speaker 911 converts the audio signal that isoutput from the smartphone 900 to a sound.

The wireless communication interface 912 supports a cellularcommunication system such as LTE or LTE-Advanced, and performs wirelesscommunication. The wireless communication interface 912 may typicallyinclude the BB processor 913, the RF circuit 914, and the like. The BBprocessor 913 may, for example, perform encoding/decoding,modulation/demodulation, multiplexing/demultiplexing, and the like, andperforms a variety of types of signal processing for wirelesscommunication. On the other hand, the RF circuit 914 may include amixer, a filter, an amplifier, and the like, and transmits and receivesa wireless signal via the antenna 916. The wireless communicationinterface 912 may be a one-chip module in which the BB processor 913 andthe RF circuit 914 are integrated. The wireless communication interface912 may include a plurality of BB processors 913 and a plurality of RFcircuits 914 as illustrated in FIG. 18. Note that FIG. 18 illustrates anexample in which the wireless communication interface 912 includes aplurality of BB processors 913 and a plurality of RF circuits 914, butthe wireless communication interface 912 may include a single BBprocessor 913 or a single RF circuit 914.

Further, the wireless communication interface 912 may support othertypes of wireless communication system such as a short range wirelesscommunication system, a near field communication system, and a wirelesslocal area network (LAN) system in addition to the cellularcommunication system, and in this case, the wireless communicationinterface 912 may include the BB processor 913 and the RF circuit 914for each wireless communication system.

Each antenna switch 915 switches a connection destination of the antenna916 among a plurality of circuits (for example, circuits for differentwireless communication systems) included in the wireless communicationinterface 912.

Each of the antennas 916 includes one or more antenna elements (forexample, a plurality of antenna elements constituting a MIMO antenna)and is used for transmission and reception of the wireless signal by thewireless communication interface 912. The smartphone 900 may include aplurality of antennas 916 as illustrated in FIG. 18. Note that FIG. 18illustrates an example in which the smartphone 900 includes a pluralityof antennas 916, but the smartphone 900 may include a single antenna916.

Further, the smartphone 900 may include the antenna 916 for eachwireless communication system. In this case, the antenna switch 915 maybe omitted from a configuration of the smartphone 900.

The bus 917 connects the processor 901, the memory 902, the storage 903,the external connection interface 904, the camera 906, the sensor 907,the microphone 908, the input device 909, the display device 910, thespeaker 911, the wireless communication interface 912, and the auxiliarycontroller 919 to each other. The battery 918 supplies electric power toeach block of the smartphone 900 illustrated in FIG. 18 via a feederline that is partially illustrated in the figure as a dashed line. Theauxiliary controller 919, for example, operates a minimally necessaryfunction of the smartphone 900 in a sleep mode.

Second Application Example

FIG. 19 is a block diagram illustrating an example of a schematicconfiguration of a car navigation apparatus 920 to which the technologyaccording to the present disclosure may be applied. The car navigationapparatus 920 includes a processor 921, a memory 922, a globalpositioning system (GPS) module 924, a sensor 925, a data interface 926,a content player 927, a storage medium interface 928, an input device929, a display device 930, a speaker 931, a wireless communicationinterface 933, one or more antenna switches 936, one or more antennas937, and a battery 938.

The processor 921 may be, for example, a CPU or an SoC, and controls thenavigation function and the other functions of the car navigationapparatus 920. The memory 922 includes a RAM and a ROM, and stores aprogram executed by the processor 921 and data.

The GPS module 924 uses a GPS signal received from a GPS satellite tomeasure the position (e.g., latitude, longitude, and altitude) of thecar navigation apparatus 920. The sensor 925 may include a sensor groupincluding, for example, a gyro sensor, a geomagnetic sensor, abarometric sensor and the like. The data interface 926 is, for example,connected to an in-vehicle network 941 via a terminal that is notillustrated, and acquires data such as vehicle speed data generated onthe vehicle side.

The content player 927 reproduces content stored in a storage medium(e.g., CD or DVD) inserted into the storage medium interface 928. Theinput device 929 includes, for example, a touch sensor which detectsthat a screen of the display device 930 is touched, a button, a switchor the like, and accepts operation or information input from a user. Thedisplay device 930 includes a screen such as LCDs and OLED displays, anddisplays an image of the navigation function or the reproduced content.The speaker 931 outputs a sound of the navigation function or thereproduced content.

The wireless communication interface 933 supports a cellularcommunication system such as LTE or LTE-Advanced, and performs wirelesscommunication. The wireless communication interface 933 may typicallyinclude the BB processor 934, the RF circuit 935, and the like. The BBprocessor 934 may, for example, perform encoding/decoding,modulation/demodulation, multiplexing/demultiplexing, and the like, andperforms a variety of types of signal processing for wirelesscommunication. On the other hand, the RF circuit 935 may include amixer, a filter, an amplifier, and the like, and transmits and receivesa wireless signal via the antenna 937. The wireless communicationinterface 933 may be a one-chip module in which the BB processor 934 andthe RF circuit 935 are integrated. The wireless communication interface933 may include a plurality of BB processors 934 and a plurality of RFcircuits 935 as illustrated in FIG. 19. Note that FIG. 19 illustrates anexample in which the wireless communication interface 933 includes aplurality of BB processors 934 and a plurality of RF circuits 935, butthe wireless communication interface 933 may include a single BBprocessor 934 or a single RF circuit 935.

Further, the wireless communication interface 933 may support othertypes of wireless communication system such as a short range wirelesscommunication system, a near field communication system, and a wirelessLAN system in addition to the cellular communication system, and in thiscase, the wireless communication interface 933 may include the BBprocessor 934 and the RF circuit 935 for each wireless communicationsystem.

Each antenna switch 936 switches a connection destination of the antenna937 among a plurality of circuits (for example, circuits for differentwireless communication systems) included in the wireless communicationinterface 933.

Each of the antennas 937 includes one or more antenna elements (forexample, a plurality of antenna elements constituting a MIMO antenna)and is used for transmission and reception of the wireless signal by thewireless communication interface 933. The car navigation apparatus 920may include a plurality of antennas 937 as illustrated in FIG. 19. Notethat FIG. 19 illustrates an example in which the car navigationapparatus 920 includes a plurality of antennas 937, but the carnavigation apparatus 920 may include a single antenna 937.

Further, the car navigation apparatus 920 may include the antenna 937for each wireless communication system. In this case, the antenna switch936 may be omitted from a configuration of the car navigation apparatus920.

The battery 938 supplies electric power to each block of the carnavigation apparatus 920 illustrated in FIG. 19 via a feeder line thatis partially illustrated in the figure as a dashed line. Further, thebattery 938 accumulates the electric power supplied from the vehicle.

The technology of the present disclosure may also be realized as anin-vehicle system (or a vehicle) 940 including one or more blocks of thecar navigation apparatus 920, the in-vehicle network 941, and a vehiclemodule 942. The vehicle module 942 generates vehicle data such asvehicle speed, engine speed, and trouble information, and outputs thegenerated data to the in-vehicle network 941.

Further, the effects described in this specification are merelyillustrative or exemplified effects, and are not limitative. That is,with or in the place of the above effects, the technology according tothe present disclosure may achieve other effects that are clear to thoseskilled in the art from the description of this specification.

Additionally, the present technology may also be configured as below.

(1)

A terminal device that communicates with a base station device, theterminal station device including:

a higher layer processing unit configured to set at least one first RATand at least one second RAT by signaling of a higher layer from the basestation device; and

a receiving unit configured to receive a transmission signal in thefirst RAT and a transmission signal in the second RAT,

in which the transmission signal in the first RAT is mapped to aresource element configured on a basis of one physical parameter foreach sub frame, and

the transmission signal in the second RAT is mapped to a resourceelement configured on a basis of one or more physical parameters foreach sub frame and is mapped to a resource element configured on a basisof one physical parameter in a predetermined resource included in eachof the sub frames.

(2)

The terminal device according to (1), in which the higher layerprocessing unit sets the physical parameter used for the transmissionsignal in the second RAT.

(3)

The terminal device according to (1) or (2), in which, in a case inwhich the physical parameter is not set, the transmission signal in thesecond RAT is generated on a basis of a physical parameter specified inadvance.

(4)

The terminal device according to any one of (1) to (3), in which thephysical parameter is a sub carrier interval.

(5)

The terminal device according to any one of (1) to (3), in which thephysical parameter is a symbol length.

(6)

The terminal device according to any one of (1) to 3, in which thephysical parameter is a number of subcarriers in the predeterminedresource included in each of the sub frames.

(7)

The terminal device according to any one of (1) to 3, in which thephysical parameter is a number of symbols in the predetermined resourceincluded in each of the sub frames.

(8)

The terminal device according to any one of (1) to 7, in which each ofthe resource elements to which the transmission signal in the second RATis mapped is configured using a predetermined number of sub resourceelements corresponding to the physical parameter.

(9)

The terminal device according to (8), in which the higher layerprocessing unit sets the predetermined number of sub resource elementsin the predetermined resource.

(10)

A base station device that communicates with a terminal device, the basestation device including:

a higher layer processing unit configured to set at least one first RATand at least one second RAT by signaling of a higher layer to theterminal device; and

a transmitting unit configured to transmit a transmission signal in thefirst RAT and a transmission signal in the second RAT,

in which the transmission signal in the first RAT is mapped to aresource element configured on a basis of one physical parameter foreach sub frame, and

the transmission signal in the second RAT is mapped to a resourceelement configured on a basis of one or more physical parameters foreach sub frame and is mapped to a resource element configured on a basisof one physical parameter in a predetermined resource included in eachof the sub frames.

(11)

A communication method that is used in a terminal device communicatingwith a base station device, the communication method including:

a step of setting at least one first RAT and at least one second RAT bysignaling of a higher layer from the base station device; and

a step of receiving a transmission signal in the first RAT and atransmission signal in the second RAT,

in which the transmission signal in the first RAT is mapped to aresource element configured on a basis of one physical parameter foreach sub frame, and

the transmission signal in the second RAT is mapped to a resourceelement configured on a basis of one or more physical parameters foreach sub frame and is mapped to a resource element configured on a basisof one physical parameter in a predetermined resource included in eachof the sub frames.

(12)

A communication method that is used in a base station devicecommunicating with a terminal device, the communication methodincluding:

a step of setting at least one first RAT and at least one second RAT bysignaling of a higher layer to the terminal device; and

a step of transmitting a transmission signal in the first RAT and atransmission signal in the second RAT,

in which the transmission signal in the first RAT is mapped to aresource element configured on a basis of one physical parameter foreach sub frame, and

the transmission signal in the second RAT is mapped to a resourceelement configured on a basis of one or more physical parameters foreach sub frame and is mapped to a resource element configured on a basisof one physical parameter in a predetermined resource included in eachof the sub frames.

1. A user equipment comprising: a transceiver; and a processingcircuitry coupled to the transceiver, the processing circuit beingconfigured to: receive by RRC signaling: first information indicating aparameter regarding a Synchronization Signal (SS) and Physical BroadcastChannel (PBCH), wherein the parameter regarding the SS and the PBCHcomprises a subcarrier spacing common to the SS and the PBCH, and secondinformation indicating start point of resources where the SS and thePBCH are transmitted; and receive the SS and the PBCH based on the firstinformation and the second information, wherein the resources where theSS and the PBCH are transmitted are successive resources decided basedon the start point, and wherein the SS includes a PrimarySynchronization signal (PSS) and a Secondary Synchronization Signal(SSS).
 2. The user equipment according to claim 1, wherein thesubcarrier spacing common to the SS and the PBCH is one of multiplesubcarrier spacings configured for one cell.
 3. The user equipmentaccording to claim 2, wherein the subcarrier spacing common to the SSand the PBCH is independently configured for each of a plurality ofpredetermined frequency resources configured for the one cell.
 4. A basestation apparatus comprising: a transceiver; and a processing circuitrycoupled to the transceiver, the processing circuitry being configuredto: provide, by Radio Resource Control (RRC) signaling: firstinformation indicating a parameter regarding a Synchronization Signal(SS) and Physical Broadcast Channel (PBCH), wherein the parameterregarding the SS and the PBCH comprises a subcarrier spacing common tothe SS and the PBCH, and second information indicating a start point ofresources where the SS and the PBCH are transmitted; and transmit the SSand the PBCH based on the first information and the second information,wherein the resources where the SS and the PBCH are transmitted aresuccessive resources decided based on the start point, and wherein theSS includes a Primary Synchronization signal (PSS) and a SecondarySynchronization Signal (SSS).
 5. The base station apparatus according toclaim 4, wherein the base station apparatus is a base station itself ora Remote Radio Head (RRH) connected with the base station.
 6. The basestation apparatus according to claim 5, wherein the subcarrier spacingcommon to the SS and the PBCH is one of multiple subcarrier spacingsconfigured for one cell.
 7. The base station apparatus according toclaim 6, wherein the subcarrier spacing common to the SS and the PBCH isindependently configured for each of a plurality of predeterminedfrequency resources configured for the one cell.
 8. A method for a userequipment, the method comprising: receiving a System Information Block(SIB) including: first information indicating a parameter regarding aSynchronization Signal (SS) and Physical Broadcast Channel (PBCH),wherein the parameter regarding the SS and the PBCH comprises asubcarrier spacing common to the SS and the PBCH, and second informationindicating a start point of resources where the SS and the PBCH aretransmitted; and receiving the SS and the PBCH based on the firstinformation and the second information, wherein the resources where theSS and the PBCH are transmitted are successive resources decided basedon the start point, and wherein the SS includes a PrimarySynchronization signal (PSS) and a Secondary Synchronization Signal(SSS).
 9. The method according to claim 8, wherein the subcarrierspacing common to the SS and the PBCH is one of multiple subcarrierspacings configured for one cell.
 10. The method according to claim 9,wherein the subcarrier spacing common to the SS and the PBCH isindependently configured for each of a plurality of predeterminedfrequency resources configured for the one cell.
 11. A method for a basestation apparatus, the method comprising: transmitting a SystemInformation Block (SIB) including: first information indicating aparameter regarding a Synchronization Signal (SS) and Physical BroadcastChannel (PBCH), wherein the parameter regarding the SS and the PBCHcomprises a subcarrier spacing common to the SS and the PBCH, and secondinformation indicating a start point of resources where the SS and thePBCH are transmitted; and transmitting the SS and the PBCH based on thefirst information and the second information, wherein the resourceswhere the SS and the PBCH are transmitted are successive resourcesdecided based on the start point, and wherein the SS includes a PrimarySynchronization signal (PSS) and a Secondary Synchronization Signal(SSS).
 12. The method according to claim 11, wherein the base stationapparatus is a base station itself or a Remote Radio Head (RRH)connected with the base station.
 13. The method according to claim 12,wherein the subcarrier spacing common to the SS and the PBCH is one ofmultiple subcarrier spacings configured for one cell.
 14. The methodaccording to claim 13, wherein the subcarrier spacing common to the SSand the PBCH is independently configured for each of a plurality ofpredetermined frequency resources configured for the one cell.